Method and apparatus for call setup within a voice frame network

• US 7,181,522 B2
• Filed: 09/02/2004
• Issued: 02/20/2007
• Est. Priority Date: 06/28/2000
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Tasker, Michael E., Shah, Dhaval N., Joffe, Neil R.
• Primary Examiner(s): Winder; Patrice
• Assistant Examiner(s): CHOUDHURY, AZIZUL Q
• Application Number:
  US10/934,827
• Publication Number:
  US 20050027861A1
• Time in Patent Office: 901 Days
• Field of Search: None
• US Class Current: 709/224
• CPC Class Codes: H04L 43/12 Network monitoring probes
• CPC Class Codes: H04L 61/25 of the same type
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04Q 3/0087 Network testing or monitoring arrangements

Abstract

The method involves transmitting plural endpoint probes to produce plural endpoint probe results indicating the preparedness of the endpoints for calls routed thereto; identifying similarly situated endpoints; and representing each of the similarly situated endpoints by a reduced number of recorded endpoint probe results that substantially represent the inter-connective preparedness of each of the similarly situated endpoints. The apparatus includes a mapping mechanism for mapping the probe results for the similarly situated endpoints into a reduced number of endpoint probe results that substantially represent the inter-connective preparedness of each of the similarly situated endpoints, and a recording mechanism for recording the reduced number of endpoint probe results. Such mapping permits an Internet operating system (IOS) router/gateway to act as an real-time responder/service assurance agent (RTR/SAA) proxy on behalf of non-RTR/SAA capable voice over Internet protocol (VoIP) endpoints.

Claims

1. A method of analyzing network endpoint probing results, the method comprising:

transmitting or receiving a plurality of endpoint probes associated with multiple different endpoint addresses;

identifying a group of the multiple endpoint addresses associated with a same network domain;

using a reduced number of network addresses less than a total number of the identified endpoint addresses to identify probe results for all of the identified endpoint addresses; and

caching all of the identified endpoint addresses in the reduced number of network addresses thereby reducing a total amount of cache required to store network preparedness results for the identified endpoint addresses.

2. The method of claim 1 including receiving probe results for the individual endpoint addresses in the identified group and using a single network processing device address to identify the probe results for all of the individual endpoint addresses.

3. The method of claim 1 including using probe results for one of the identified endpoint addresses to represent probe results for multiple ones of the identified endpoint addresses.

4. The method of claim 1 including associating at least one of the reduced network addresses with a Public Branch Exchange (PBX) and associating multiple ones of the identified endpoint addresses with Internet Protocol (IP) phones.

5. The method of claim 1 including associating at least one of the identified endpoint addresses with an Internet protocol (IP) voice gateway.

6. An apparatus for consolidating plural endpoint probing results into a reduced number of representative endpoint probing results, the apparatus comprising:

a mapping mechanism for mapping probe results for multiple endpoints into a reduced number of endpoint probe results that substantially represent the preparedness of each of the multiple endpoints, the mapping mechanism identifying the multiple endpoints within a network by their individual network addresses and mapping endpoint probe results associated with the individual network addresses into a same network address that is representative of the endpoints;

a recording mechanism for recording the reduced number of endpoint probe results and associating the reduced number of endpoint probe results with the same network address; and

a proxy reporting mechanism for reporting the reduced-and-recorded endpoint probe results as representative of one or more of the multiple endpoints that is mapped by said mapping mechanism into such reduced-and-recorded endpoint probe results.

7. The apparatus of claim 6 which further comprises:

a caching mechanism for caching the reduced-and-recorded probe results for the multiple endpoints.

8. The apparatus of claim 7 which further comprises:

a pinging mechanism for producing the probe results for the multiple endpoints, said pinging mechanism testing the multiple endpoints to determine the preparedness thereof for calls routed thereto.

9. The apparatus of claim 6, wherein at least one of the multiple endpoints includes an Internet protocol (IP) phone.

10. The apparatus of claim 6, wherein at least one of the multiple endpoints includes an Internet protocol (IP) voice gateway.

11. The apparatus of claim 6 wherein the mapping mechanism does not map each probe result into an endpoint probe result.

12. The apparatus of claim 11 wherein each endpoint probe result corresponds to a cache entry.

13. The apparatus of claim 6 wherein the mapping mechanism maps the probe results for multiple endpoints into a reduced number of endpoint probe results because probe results for a plurality of the endpoints are mapped into a single endpoint probe result.

14. The apparatus of claim 13 wherein the plurality of endpoints are associated with a same network domain.

15. A voice frame network address consolidation method for use with multiple endpoints to determine their interconnectivity preparedness, the method comprising:

identifying the multiple endpoints within a voice frame network by their individual network addresses;

mapping the network addresses of the identified endpoints into a single network address that is representative of the multiple endpoints;

utilizing pinging results for the mapped-to network address to represent the interconnectivity preparedness of the multiple endpoints;

assigning a cache entry for the pinging results; and

mapping the cache entry to each of the multiple endpoints.

16. The method of claim 15, wherein at least one of the endpoints includes an Internet protocol (IP) phone.

17. The method of claim 15, wherein at least one of the endpoints includes an Internet protocol (IP) voice gateway.

18. A computer-readable medium containing a program for consolidating voice frame network address endpoint probe results to determine interconnectivity preparedness, the program comprising:

instructions for identifying multiple endpoints within a network by their individual network addresses;

instructions for mapping the network addresses of the identified multiple endpoints into a single network address that is representative of the multiple endpoints;

instructions for utilizing pinging results for the mapped-to network address to represent the interconnectivity preparedness of the multiple endpoints that are mapped thereto;

instructions for assigning a cache entry for the pinging results; and

instructions for mapping the cache entry to each of the multiple endpoints.

19. The computer-readable medium in accordance with claim 18, wherein at least one of the multiple endpoints includes an Internet protocol (IP) phone.

20. The computer-readable medium in accordance with claim 18, wherein at least one of the multiple endpoints includes an Internet protocol (IP) voice gateway.

21. An apparatus for consolidating plural endpoint probe results into a reduced number of representative endpoint probe results, the apparatus comprising:

means for identifying endpoints within a voice frame network by their individual network addresses;

means for mapping the network addresses of the identified ones of the endpoints into a network address that is representative of the endpoints;

means for utilizing pinging results for the mapped-to network address to represent the interconnectivity preparedness of the endpoints that are mapped thereto;

means for assigning a cache entry for the pinging results; and

means for mapping the cache entry to each of the multiple endpoints.

22. The apparatus of claim 21 wherein at least one of the endpoints includes an Internet protocol (IP) phone.

23. The apparatus of claim 22, wherein at least one of the endpoints includes an Internet protocol (IP) voice gateway.

24. The apparatus of claim 21 wherein the pinging results are received in response to sending a probe that emulates a burst of voice packets.

25. The apparatus of claim 24 wherein the probe is a Response Time Reporter/Service Assurance Agent (RTR/SAA) probe.

26. An apparatus for use with a Private Branch Exchange or Voice Gateway (PBX-VG) comprising:

a mapping mechanism to map cache entries for network elements;

a database to associate the PBX-VG with multiple phones in response to a determination that the PBX-VG and the multiple phones are all part of a same Internet Protocol (IP) subnet and to provide said association to said mapping mechanism;

a probing mechanism to send a voice data congestion probe emulating a burst of voice packets and to receive back a voice data congestion probe result for the PBX-VG;

a cache controller to assign a cache entry for the voice data congestion probe result;

said mapping mechanism to map the cache entry to each of the PBX-VG and the multiple phones in response to said providing;

a pointer to identify said mapping by a network address for said IP subnet;

wherein the cache controller is configured to provide the probe result in response to voice data packet delay, jitter or loss inquiries for any of the multiple phones; and

wherein one cache entry represents the PBX and the multiple phones.

27. Logic encoded in one or more tangible media for execution and when executed operable to:

ping first and second remote endpoints using separate communications;

receive back separate responses at a local network device that identify a first pinging result for the first remote endpoint and a second pinging result for the second remote endpoint;

determine whether the first and second remote endpoints are located on a same private network;

store only the first pinging result in a single cache entry in a cache and do not store the second pinging result in the cache when the first and second remote endpoints are located on the same private network;

associate the first and second remote endpoints in a mapping mechanism that is independent of the cache, separate from the cache and non-integrated with the cache; and

configure the cache and the mapping mechanism to provide the first pinging result in response to a request for a latency measurement between the local network device and the second remote endpoint after associating the first and second remote endpoints in the mapping mechanism.

28. The logic of claim 27 further operable to:

store both the first and second pinging results in different cache entries in the cache when the first and second remote endpoints are not located on the same private network; and

configure the cache and the mapping mechanism to provide the second pinging result in response to a request for the latency measurement between the local network device and the second remote endpoint after storing the second pinging result in one of the different cache entries in the cache.

29. The logic of claim 27 further operable to:

receive a call request for a call from the local network device to the second remote endpoint;

request the latency measurement between the local network device and the second remote endpoint in response to receiving the call request for the call to the second remote endpoint;

receive the first probe result from the cache when the mapping mechanism associates the first and second remote endpoints; and

receive the second probe result from the cache when the mapping mechanism does not associate the first and second remote endpoints.

30. A method comprising:

sending a first emulation of a burst of voice packets from a network device over a publicly addressable network to an access router that provides access to the publicly addressable network from a private network;

receiving back a first response that identifies a first probe result for the first emulation of the burst of voice packets;

sending a second emulation of the same or another burst of voice packets over the publicly addressable network, through the access router, through the private network to an Internet Protocol (IP) phone located in the private network;

receiving back a second response that identifies a second probe result for the second emulation;

comparing a first address for the access router to a second address for the IP phone to identify the private network containing both the access router and the IP phone;

associating the first and second addresses in a table according to the comparison; and

storing the first probe result for the access router in a cache entry in a local cache.

31. The method of claim 30, further comprising:

receiving a call request at the network device for a call to a remote endpoint;

comparing a remote address for the remote endpoint to the table responsive to receiving the call request for the call to the remote endpoint;

identifying a subnet address for the first and second addresses when the table associates the remote address with the first address;

providing the subnet address to a cache controller for the local cache when the first address is identified;

hitting the cache entry that includes the first probe results in response to said providing; and

establishing the call with the remote endpoint according to the first probe result included in the cache entry.

32. The method of claim 31 wherein the remote address is the second address for the IP phone.

33. The method of claim 31 wherein the remote endpoint is a different IP phone located in the private network.

34. The method of claim 33 wherein the remote address is one of the multitude of addresses.

35. The method of claim 31 wherein the table associates a multitude of addresses for a multitude of remote devices located in the private network with the subnet address.

36. The method of claim 31 wherein the first and second emulations of the burst of voice packets are Response Time Reporter/Service Assurance Agent (RTR/SAA) probes.