Patent ID: 8051129
Filing Date: 2011-11-01
Classification: H04L

Abstract:
1. A method of reducing memory usage in first and second servers communicating in a communication network, said method comprising: establishing a Session Initiation Protocol (SIP) dialogue between the first and second servers to support a first SIP request and SIP response message pair sent between the two servers; and utilizing the established SIP dialogue to support a second SIP request and SIP response message pair subsequently sent between the two servers, wherein the utilizing step includes: creating and storing by the second server, a subscription-dialogue relation associating the second SIP request and SIP response message pair with the established SIP dialogue; sending the SIP response message from the second server to the first server identifying the existing established SIP dialogue, wherein the second server sends a first type of SIP response message to the first server when an established SIP dialogue does not already exist with the first server, and sends a second type of SIP response message to the first server when an established SIP dialogue already exists with the first server, wherein the second type of SIP response message is different from the first type of SIP response message; creating and storing by the first server, a subscription-dialogue relation associating the requested SIP subscription with the established SIP dialogue; and utilizing the stored subscription-dialogue relation to link the second SIP request and SIP response message pair to the established SIP dialogue; wherein the number of SIP dialogues between the first and second servers is reduced, together with the associated memory usage.