Methods systems, and computer program products for providing voicemail routing information in a network that provides customized voicemail services

• US 8,730,970 B2
• Filed: 08/10/2007
• Issued: 05/20/2014
• Est. Priority Date: 02/23/2007
• Status: Active Grant

• Current Assignee: Tekelec Global, Inc. (Oracle Corporation)
• Original Assignee: Tekelec Global, Inc. (Oracle Corporation)
• Inventors: Allison, Rick L., Bantukul, Apirux, Marsico, Peter J.
• Primary Examiner(s): Zhu, Alvin
• Application Number:
  US11/891,677
• Publication Number:
  US 20080205603A1
• Time in Patent Office: 2,475 Days
• Field of Search: 370/395.2, 370/395.3, 370/395.31, 379/88.18, 379/88.28, 379/88.26, 379/88.27, 455/412, 455/412.2, 455/413
• US Class Current: 370/395.2
• CPC Class Codes: H04M 3/42136 Administration or customisation of services
• CPC Class Codes: H04M 3/53325 Interconnection arrangements between voice mail systems
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 4/029 Location-based management or tracking services
• CPC Class Codes: H04W 4/12 Messaging; Mailboxes; Announcements

Abstract

Methods, systems, and computer program products for providing voicemail routing information in a network that provides customized voicemail services are disclosed. According to one method, a voicemail routing query is received at an advanced voicemail routing node, where the query includes at least one parameter associated with a voicemail transaction. Based on at least one query parameter, voicemail routing information may be determined that identifies a voicemail server and a voicemail service from among a plurality of voicemail servers, where at least some of the voicemail servers provide different services. A voicemail routing query response may then be generated including the determined voicemail routing information.

Claims

1. A method for providing voicemail routing information, the method comprising:

receiving a voicemail routing query message including at least one query message parameter associated with a voicemail transaction, wherein the voicemail routing query message is associated with a subscriber of one or more advanced voicemail services;

determining voicemail routing information based on the at least one query message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies a voicemail server and a voicemail service, and wherein determining the voicemail routing information based on the at least one query message parameter includes identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one query parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information; and

generating a voicemail routing response message including the determined voicemail routing information.

2. The method of claim 1 wherein receiving a voicemail routing query message includes receiving a voicemail routing query message generated by a mobile switching center (MSC).

3. The method of claim 1 wherein determining voicemail routing information based on the at least one query message parameter includes determining the voicemail routing number using another query message parameter selected from the group consisting of a message transfer part (MTP) originating point code (OPC), MTP destination point code (DPC), SCCP called party (CdPA), called party number (CdPN), called party directory number (DN), redirect indicator (RDI), redirecting dialed number (RDN), and a bearer capabilities indicator.

4. The method of claim 1 wherein receiving a voicemail routing query message includes receiving one of an intelligent network application part (INAP) initial detection point (IDP) query message and a customized applications for mobile networks enhanced logic (CAMEL) application part (CAP) query message.

5. The method of claim 1 wherein determining voicemail routing information includes performing a lookup in a database including voicemail routing information and being indexed by voicemail query parameters.

6. The method of claim 5 wherein performing a lookup in a database includes performing a lookup in a database including at least one range-based entry for associating a range of subscriber identifiers with a voicemail server and at least one exception-based entry for associating an individual subscriber identifier with a voicemail server.

7. The method of claim 1 wherein determining voicemail routing information based on at least one query message parameter includes determining a voicemail server center (VMSC) identifier (ID), where the VMSC ID identifies a VMSC, determining a voicemail (VM) index identifying a voicemail service, and based on the VMSC ID and the VM index, determining the voicemail routing number.

8. The method of claim 1 wherein generating a voicemail routing response message includes generating at least one of an intelligent network application part (INAP) response message and a customized applications for mobile networks enhanced logic (CAMEL) application part (CAP) response message.

9. A method for providing voicemail routing information, the method comprising:

receiving a voicemail routing query message including at least one parameter associated with a session initiation protocol (SIP) transaction, wherein the voicemail routing query message is associated with a subscriber of one or more advanced voicemail services;

determining voicemail routing information based on the at least one query message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies a voicemail server and a voicemail service, and wherein determining the voicemail routing information based on the at least one query message parameter includes identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one query parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information; and

generating a voicemail routing response message including the determined voicemail routing information.

10. The method of claim 9 wherein receiving a voicemail routing query message includes receiving a message containing at least one of a called party identifier, a media type, and a cause code.

11. The method of claim 10 wherein receiving a voicemail routing query message includes reading a message containing one of an audio media type, a video media type, and a text media type.

12. The method of claim 10 wherein receiving a voicemail routing query message includes reading a message at least one of a busy 486 cause code, an unknown/not available 404 cause code, a no reply 408 cause code, a unconditional 302 cause code, a deflection during alerting 487 cause code, a deflection immediate response 480 cause code, and a mobile subscriber not reachable 503 cause code.

13. The method of claim 9 wherein determining voicemail routing information includes determining a transaction type that includes one of a default transaction, a deposit transaction, and a retrieval transaction and a media transaction type that includes one of a video voicemail transaction, an audio voicemail transaction, and a text voicemail transaction.

14. A method for routing a session initiation protocol (SIP) signaling message to a voicemail server, the method comprising:

receiving a SIP signaling message that includes at least one parameter associated with a SIP transaction, wherein the SIP signaling message is associated with a subscriber of one or more advanced voicemail services;

determining voicemail routing information based on the at least one SIP signaling message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, and wherein determining the voicemail routing information based on the at least one SIP signaling message parameter includes identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one SIP signaling message parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information; and

forwarding the SIP signaling message to the identified voicemail server.

15. The method of claim 14 wherein receiving a SIP signaling message includes receiving a SIP Invite message.

16. The method of claim 14 wherein receiving a SIP signaling message includes receiving a SIP signaling message containing at least one of a called party identifier, a media type, and a cause code.

17. The method of claim 15 wherein receiving a SIP signaling message includes receiving a SIP signaling message containing one of an audio media type, a video media type, and a text media type.

18. The method of claim 15 wherein receiving a SIP signaling message includes receiving a SIP signaling message including one of a busy 486 cause code, an unknown/not available 404 cause code, a no reply 408 cause code, a unconditional 302 cause code, a deflection during alerting 487 cause code, a deflection immediate response 480 cause code, and a mobile subscriber not reachable 503 cause code.

19. The method of claim 14 wherein determining voicemail routing information includes determining a transaction type that includes one of a default transaction, a deposit transaction, and a retrieval transaction and a media transaction type that includes one of a video voicemail transaction, an audio voicemail transaction, and a text voicemail transaction.

20. The method of claim 14 wherein forwarding the SIP signaling message includes modifying the SIP signaling message to include the voicemail routing information and forwarding the SIP signaling message to the voicemail server.

21. A method for triggerlessly providing voicemail routing information, the method comprising:

receiving a first integrated services digital network user part (ISUP) signaling message that includes at least one parameter associated with an advanced voicemail service, wherein the first ISUP signaling message is associated with a subscriber of one or more advanced voicemail services;

determining voicemail routing information based on the at least one ISUP signaling message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, and wherein determining the voicemail routing information based on the at least one ISUP signaling message parameter includes identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one ISUP signaling message parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information;

terminating the first received ISUP signaling message;

generating and transmitting an ISUP response message that includes the determined voicemail routing information;

receiving a second ISUP signaling message that includes the determined voicemail routing information; and

forwarding the second ISUP signaling message to the identified voicemail server.

22. A method for triggerlessly providing voicemail routing information, the method comprising:

intercepting an integrated services digital network user part (ISUP) signaling message that includes at least one parameter associated with an advanced voicemail transaction, wherein the ISUP signaling message is associated with a subscriber of one or more advanced voicemail services;

determining voicemail routing information based on the at least one ISUP signaling message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, and wherein determining the voicemail routing information based on the at least one ISUP signaling message parameter includes identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one ISUP signaling message parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information;

modifying the ISUP signaling message to include the determined voicemail routing information; and

forwarding the modified ISUP signaling message to the identified voicemail server.

23. An advanced voicemail routing node for providing voicemail routing information, the node comprising:

a communications module configured to receive a voicemail routing query message including at least one query message parameter associated with a voicemail transaction, wherein the voicemail routing query message is associated with a subscriber of one or more advanced voicemail services; and

a voicemail routing module configured to determine voicemail routing information based on the at least one query message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, and to generate a voicemail routing response message including the determined voicemail routing information, wherein the voicemail routing module is configured to determine the voicemail routing information based on the at least one query message parameter by identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one query parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information.

24. The advanced voicemail routing node of claim 23 wherein the communications module is configured to receive the voicemail routing query message from a mobile switching center (MSC).

25. The advanced voicemail routing node of claim 23 wherein the voicemail routing query message contains at least another query parameter selected from the group consisting of a message transfer part (MTP) originating point code (OPC), MTP destination point code (DPC), SCCP called party (CdPA), called party number (CdPN), directory number (DN), redirect indicator (RDI), original called number (OCN), redirecting dialed number (RDN), and a bearer capabilities indicator.

26. The advanced voicemail routing node of claim 23 wherein the communication module is configured to receive at least one of an intelligent network application part (INAP) initial detection point (IDP) voicemail routing query message and a customized applications for mobile networks enhanced logic (CAMEL) application part (CAP) voicemail routing query message.

27. The advanced voicemail routing node of claim 23 comprising a database including voicemail routing information and being indexed by voicemail query parameters.

28. The advanced voicemail routing node of claim 27 wherein the database includes at least one range-based entry for associating a range of subscriber identifiers with a voicemail server and at least one exception-based entry for associating an individual subscriber identifier with a voicemail server.

29. The advanced voicemail routing node of claim 23 wherein the voicemail routing module is configured to determine a voicemail server center (VMSC) identifier (ID), where the VMSC ID identifies a VMSC, and to determine a voicemail (VM) index identifying a voicemail service, and to determine the voicemail routing number based on the VMSC ID and VM index.

30. The advanced voicemail routing node of claim 23 wherein the voice mail routing information module is configured to generate at least one of an intelligent network application part (INAP) voicemail routing response message and a customized applications for mobile networks enhanced logic (CAMEL) application part (CAP) voicemail routing response message.

31. An advanced voicemail routing node for providing voicemail routing information, the node comprising:

a communications module configured to receive a voicemail routing query message including at least one parameter associated with a session initiation protocol (SIP) transaction, wherein the voicemail routing query message is associated with a subscriber of one or more advanced voicemail services; and

a voicemail routing module configured to determine voicemail routing information based on the at least one query message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, and to generate a voicemail routing response message including the determined voicemail routing information, wherein the voicemail routing module is configured to determine the voicemail routing information based on the at least one query message parameter by identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one query parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information.

32. The advanced voicemail routing node of claim 31 wherein the communications module is configured to receive a voicemail routing query message containing at least one of a called party identifier, a media type, and a cause code.

33. The advanced voicemail routing node of claim 32 wherein the communications module is configured to receive a voicemail routing query message containing one of an audio media type, a video media type, and a text media type.

34. The advanced voicemail routing node of claim 32 wherein the communications module is configured to receive a voicemail routing query message containing one of a busy 486 cause code, an unknown/not available 404 cause code, a no reply 408 cause code, a unconditional 302 cause code, a deflection during alerting 487 cause code, a deflection immediate response 480 cause code, and a mobile subscriber not reachable 503 cause code.

35. The advanced voicemail routing node of claim 31 wherein the voicemail routing module is configured to determine a transaction type that includes one of a default transaction, a deposit transaction, and a retrieval transaction and to determine a media transaction type that includes at least one of a video voicemail transaction, an audio voicemail transaction, and a text voicemail transaction.

36. An advanced voicemail routing node for routing a session initiation protocol (SIP) signaling message to a voicemail server, the node comprising:

a communications module configured to receive a SIP signaling message that includes at least one parameter associated with a SIP transaction, wherein the SIP signaling message is associated with a subscriber of one or more advanced voicemail services; and

a voicemail routing module configured to determine voicemail routing information based on the at least one SIP signaling message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, and to forward the SIP signaling message to the identified voicemail server, wherein the voicemail routing module is configured to determine the voicemail routing information based on the at least one SIP signaling message parameter by identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one SIP signaling message parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information.

37. The advanced voicemail routing node of claim 36 wherein the communications module is configured to receive a SIP Invite message.

38. The advanced voicemail routing node of claim 36 wherein the communications module is configured to receive a SIP signaling message containing at least one of a called party identifier, a media type, and a cause code.

39. The advanced voicemail routing node of claim 37 wherein the communications module is configured to receive a SIP signaling message containing one of an audio media type, a video media type, and a text media type.

40. The advanced voicemail routing node of claim 37 wherein the communications module is configured to receive a SIP signaling message including one of a busy 486 cause code, an unknown/not available 404 cause code, a no reply 408 cause code, a unconditional 302 cause code, a deflection during alerting 487 cause code, a deflection immediate response 480 cause code, and a mobile subscriber not reachable 503 cause code.

41. The advanced voicemail routing node of claim 36 wherein the voicemail routing module is configured to determine a transaction type that includes one of a default transaction, a deposit transaction, and a retrieval transaction and a media transaction type that includes one of a video voicemail transaction, an audio voicemail transaction, and a text voicemail transaction.

42. The advanced voicemail routing node of claim 36 wherein the voicemail routing module is configured to modify the SIP signaling message to include the voicemail routing information and to forward the SIP signaling message to the voicemail server.

43. An advanced voicemail routing node for triggerlessly providing voicemail routing information, the node comprising:

a communications module configured to receive a first integrated services digital network user part (ISUP) signaling message that includes at least one parameter associated with an advanced voicemail service, wherein the first ISUP signaling message is associated with a subscriber of one or more advanced voicemail services, to terminate the first received ISUP signaling message, and to receive a second ISUP signaling message that includes determined voicemail routing information; and

a voicemail routing module configured to determine voicemail routing information based on the at least one ISUP signaling message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, to generate and transmit an ISUP response message that includes the determined voicemail routing information, and to forward the second ISUP signaling message to the identified voicemail server, wherein the voicemail routing module is configured to determine the voicemail routing information based on the at least one ISUP signaling message parameter by identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one ISUP signaling message parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information.

44. An advanced voicemail routing node for triggerlessly providing voicemail routing information, the node comprising:

a communications module configured to intercept an integrated services digital network user part (ISUP) signaling message that includes at least one parameter associated with an advanced voicemail transaction, wherein the ISUP signaling message is associated with a subscriber of one or more advanced voicemail services; and

a voicemail routing module configured to determine voicemail routing information based on the at least one ISUP signaling message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, modify the ISUP signaling message to include the determined voicemail routing information, and forward the modified ISUP signaling message to the identified voicemail server, wherein the voicemail routing module is configured to determine the voicemail routing information based on the at least one ISUP signaling message parameter by identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one ISUP signaling message parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction.

45. A computer program product comprising computer executable instructions embodied in a non-transitory computer readable medium for performing steps comprising:

receiving a voicemail routing query message including at least one query message parameter associated with a voicemail transaction, wherein the voicemail routing query message is associated with a subscriber of one or more advanced voicemail services;

determining voicemail routing information based on the at least one query message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, and wherein determining the voicemail routing information based on the at least one query message parameter includes identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one query message parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information; and

generating a query response message including the determined voicemail routing information.

46. A computer program product comprising computer executable instructions embodied in a non-transitory computer readable medium for performing steps comprising:

receiving a voicemail routing query message including at least one parameter associated with a session initiation protocol (SIP) transaction, wherein the voicemail routing query message is associated with a subscriber of one or more advanced voicemail services;

determining voicemail routing information based on the at least one query message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, and wherein determining the voicemail routing information based on the at least one query message parameter includes identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one query message parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information; and

generating a voicemail routing response message including the determined voicemail routing information.

47. A computer program product comprising computer executable instructions embodied in a non-transitory computer readable medium for performing steps comprising:

receiving a session initiation protocol (SIP) signaling message that includes at least one parameter associated with a SIP transaction, wherein the SIP signaling message is associated with a subscriber of one or more advanced voicemail services;

determining voicemail routing information based on the at least one SIP signaling message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, and wherein determining the voicemail routing information based on the at least one SIP signaling message parameter includes identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one SIP signaling message parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information; and

forwarding the SIP signaling message to the identified voicemail server.

48. A computer program product comprising computer executable instructions embodied in a non-transitory computer readable medium for performing steps comprising:

receiving a first integrated services digital network user part (ISUP) signaling message that includes at least one parameter associated with an advanced voicemail service, wherein the first ISUP signaling message is associated with a subscriber of one or more advanced voicemail services;

determining voicemail routing information based on the at least one ISUP signaling message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, and wherein determining the voicemail routing information based on the at least one ISUP signaling message parameter includes identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one ISUP signaling message parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information;

terminating the first received ISUP signaling message;

generating and transmitting an ISUP response message that includes the determined voicemail routing information;

receiving a second ISUP signaling message that includes the determined voicemail routing information; and

forwarding the second ISUP signaling message to the identified voicemail server.

49. A computer program product comprising computer executable instructions embodied in a non-transitory computer readable medium for performing steps comprising:

intercepting an integrated services digital network user part (ISUP) signaling message that includes at least one parameter associated with an advanced voicemail transaction, wherein the ISUP signaling message is associated with a subscriber of one or more advanced voicemail services;

determining voicemail routing information based on the at least one ISUP signaling message parameter, wherein the voicemail routing information identifies a voicemail server configured to perform and provide the one or more advanced voicemail services, wherein the voicemail routing information includes a voicemail routing number that identifies the voicemail server and a voicemail service, and wherein determining the voicemail routing information based on the at least one ISUP signaling message parameter includes identifying the voicemail server among a plurality of voicemail servers where at least some of the voicemail servers provide different services, wherein the at least one ISUP signaling message parameter includes a subscriber identifier and a call condition, wherein the call condition indicates whether a voicemail call is associated with a voicemail deposit or a voicemail retrieval transaction and wherein each of the plurality of voicemail servers has unique routing information;

modifying the ISUP signaling message to include the determined voicemail routing information; and

forwarding the modified ISUP signaling message to the identified voicemail server.