Switch with emulation client

• US 20020110113A1
• Filed: 02/12/2001
• Published: 08/15/2002
• Est. Priority Date: 08/10/2000
• Status: Active Grant

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Wengrovitz, Michael
• Granted Patent: US 7,035,248 B2
• Time in Patent Office: Days
• US Class Current: 370/352
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04M 2203/2072 Schedules, e.g. personal calendars
• CPC Class Codes: H04M 3/42314 in private branch exchanges
• CPC Class Codes: H04M 3/5125 with remote located operators
• CPC Class Codes: H04M 3/54 Arrangements for diverting calls for one subscriber to another predetermined subscriber based on the calling party profile H04M3/42059; based on location H04M3/42348; based on presence H04M3/42365; to voice mail H04M3/53308
• CPC Class Codes: H04M 7/122 where the PSTN/ISDN access is used as an access to networks other than PSTN/ISDN access arrangements to networks other than PSTN/ISDN H04M7/0066; access arrangements to public data networks H04L12/2856
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13091 CLI, identification of calling line
• CPC Class Codes: H04Q 2213/13097 Numbering, addressing
• CPC Class Codes: H04Q 2213/13176 Common channel signaling, CCS7
• CPC Class Codes: H04Q 2213/13196 Connection circuit/link/trunk/junction, bridge, router, gateway
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/1322 PBX
• CPC Class Codes: H04Q 2213/13282 Call forward, follow-me, call diversion
• CPC Class Codes: H04Q 2213/13332 Broadband, CATV, dynamic bandwidth allocation
• CPC Class Codes: H04Q 2213/13335 Simulation, emulation
• CPC Class Codes: H04Q 2213/13339 Ciphering, encryption, security
• CPC Class Codes: H04Q 2213/1334 : Configuration within the switch
• CPC Class Codes: H04Q 2213/13389 : LAN, internet
• CPC Class Codes: H04Q 3/62 : for connecting to private branch exchanges

Abstract

A switch with emulation client in a data communication network adhering to a Session Initiation Protocol (SIP) . The switch is coupled to a legacy telephone which initiates or receives telephonic communication with a SIP-observant telephone or another legacy telephone over the SIP-observant network. The emulation client translates between PBX and SIP messages to allow the legacy telephone to communicate seamlessly over the SIP observant network. The switch is further coupled to a location server which storing redirection information for redirecting calls made to a particular number. The calls are preferably redirected based on the location where the user is scheduled to be at the time of the call.

Claims

1. A method for establishing telephonic communication between a first device and a second device over a communication network adhering to a session initiation protocol (SIP), the method comprising:

receiving a first call establishment message from the first device in a SIP-unobservant format;

generating a second call establishment message in a SIP-observant format in response to the first call establishment message; and

transmitting the second call establishment message to the second device over the communication network.

2. The method of claim 1, wherein the call establishment message is selected from a group consisting of requests, responses, and confirmations.

3. The method of claim 1, wherein the SIP-unobservant format adheres to a private branch exchange signaling protocol.

4. The method of claim 1 further comprising:

retrieving redirection information associated with the first call establishment message from a location database; and

redirecting the second call establishment message in response to the retrieved redirection information.

5. The method of claim 4, wherein the redirection information is associated with a day and a time indicative of when the call establishment message is to be redirected.

6. The method of claim 1 further comprising selecting the SIP-unobservant format from a plurality of available formats.

7. A method for establishing telephonic communication between a first device and a second device over a communication network adhering to a session initiation protocol (SIP), the method comprising:

receiving a first call establishment message from the first device in a SIP-observant format;

generating a second call establishment message in a SIP-unobservant format in response to the first call establishment message; and

transmitting the second call establishment message to the second device over the communication network.

8. The method of claim 7, wherein the call establishment message is selected from a group consisting of requests, responses, and confirmations.

9. The method of claim 7, wherein the SIP-unobservant format adheres to a private branch exchange signaling protocol.

10. The method of claim 7 further comprising:

retrieving redirection information associated with the first call establishment message from a location database; and

redirecting the second call establishment message in response to the retrieved redirection information.

11. The method of claim 10, wherein the redirection information is associated with a day and time indicative of when the call establishment message is to be redirected.

12. The method of claim 7 further comprising selecting the SIP-unobservant format from a plurality of available formats.

14. The communication network of claim 13, wherein the call establishment message is selected from a group consisting of requests, responses, and confirmations.

15. The communication network of claim 13, wherein the SIP-unobservant format adheres to a private branch exchange signaling protocol.

16. The communication network of claim 13 further comprising a location database for storing redirection information, the communication network further characterized in that the emulation client retrieves from the location database redirection information associated with the call establishment message and redirects the call establishment message based on the retrieved redirection information.

17. The communication network of claim 15, wherein the redirection information is associated with a day and time indicative of when the call establishment message is to be redirected.

18. The communication network of claim 13 further characterized in that the emulation client selects the SIP-unobservant format from a plurality of available formats.

20. The communication network of claim 18, wherein the call establishment message is selected from a group consisting of requests, responses, and confirmations.

21. The communication network of claim 18, wherein the SIP-unobservant format adheres to a private branch exchange signaling protocol.

22. The communication network of claim 18 further comprising a redirection database for storing redirection information, the communication network further characterized in that the emulation client retrieves from the location database redirection information associated with the call establishment message and redirects the call establishment message based on the retrieved redirection information.

23. The communication network of claim 21, wherein the redirection information is associated with a day and time indicative of when the call establishment message is to be redirected.

24. The communication network of claim 18 further characterized in that the emulation client selects the SIP-unobservant format from a plurality of available formats.

26. The emulation client of claim 24, wherein the call establishment message is selected from a group consisting of requests, responses, and confirmations.

27. The emulation client of claim 24, wherein the SIP-unobservant format adheres to a private branch exchange signaling protocol.

28. The emulation client of claim 24, further characterized in that redirection information associated with the call establishment message is retrieved from a redirection database for redirecting the call establishment message.

29. The emulation client of claim 27, wherein the redirection information is associated with a day and a time indicative of when the call establishment message is to be redirected.

30. The emulation client of claim 24, further characterized in that the SIP-unobservant format from a plurality of available formats.

32. The emulation client of claim 30, wherein the call establishment message is selected from a group consisting of requests, responses, and confirmations.

33. The emulation client of claim 30, wherein the SIP-unobservant format adheres to a private branch exchange signaling protocol.

34. The emulation client of claim 30, further characterized in that redirection information associated with the call establishment message is retrieved from a redirection database for redirecting the call establishment.

35. The emulation client of claim 33, wherein the redirection information is associated with a day and time indicative of when the call establishment message is to be redirected.

36. The emulation client of claim 30, further characterized in that the SIP-unobservant format is selected from a plurality of available formats.

13. A communication network adhering to a session initiation protocol (SIP) for establishing telephonic communication between devices, the network comprising:

a SIP-unobservant device;

a SIP-observant device; and

an emulation client operative between the SIP-unobservant device and the SIP-observant device, characterized in that a call establishment message transmitted by the SIP-unobservant device in a SIP-unobservant format is converted to a SIP-observant format by the emulation client and transmitted to the SIP-observant device.

19. A communication network adhering to a session initiation protocol (SIP) for establishing telephonic communication between devices, the network comprising:

a SIP-unobservant device;

a SIP-observant device; and

an emulation client operative between the SIP-unobservant device and the SIP-observant device, characterized in that a call establishment message transmitted by the SIP-observant device in a SIP-observant format is converted to a SIP-unobservant format by the emulation client and transmitted to the SIP-unobservant device.

25. An emulation client in a communication network adhering to a session initiation protocol (SIP) for establishing telephonic communication between a SIP-observant device and a SIP-unobservant device, characterized in that a call establishment message transmitted by the SIP-observant device in a SIP-observant format is converted to a SIP-unobservant format by the emulation client and transmitted to the SIP-unobservant device.

31. An emulation client in a communication network adhering to a session initiation protocol (SIP) for establishing telephonic communication between a SIP-observant device and a SIP-unobservant device, characterized in that a call establishment message transmitted by the SIP-unobservant device in a SIP-unobservant format is converted to a SIP-observant format by the emulation client and transmitted to the SIP-observant device.