Method, system and network nodes for performing a sip transaction in a session initiation protocol based communications network

A non-transitory computer-readable medium encoded with a computer program, the computer program comprising computer-executable instructions that when executed by a processor causes the processor to perform operations, wherein the operations are configured to:

• in a Session Initiation Protocol (SIP)-based communications network for sending a SIP message from a first node to a third node using a second node, receive, by the second node acting as a SIP proxy, from the first node, the SIP message;
• determine, by the second node, routing information for forwarding the SIP message to the third node based on information related to the third node stored in a repository of the second node;
• generate a pivot request, which includes the routing information, to request that the first node send the SIP message directly to the third node without traversing the second node so as to reduce a load on the SIP-based communications network;
• send, by the second node, to the first node, the pivot request;
• and
• receive, by the second node, from the first node, an acknowledgement of the pivot request;
• and
• in response to the acknowledgement, terminate a SIP server transaction model instance, that was initiated by the second node responsive to receiving the SIP message, so as to refrain from remaining active in the SIP transaction.

A second node in a SIP-based communications network for sending a Session Initiation Protocol (SIP) message from a first node to a third node using the second node, comprising:

• a memory including a repository of information related to the third node;
• and a processor operationally coupled to the memory, wherein the processor and the memory are configured to:
• receive, from the first node, the SIP message, wherein the second node acts as a SIP proxy;
• determine routing information for forwarding the SIP message to the third node based on the information related to the third node;
• and
• generate a pivot request, which includes the routing information, to request that the first node send the SIP message directly to the third node without traversing the second node so as to reduce a load on the SIP-based communications network;
• send, to the first node, the pivot request;
• receive, from the first node, an acknowledgement of the pivot request;
• and
• in response to the acknowledgement, terminate a SIP server transaction model instance, that was initiated by the second node responsive to receiving the SIP message, so as to refrain from remaining active in the SIP transaction.

A system for performing a Session Initiation Protocol (SIP) transaction in a SIP-based communications network, comprising:

• a first network node and a second network node, wherein the second network node acts as a SIP proxy;
• wherein the first network node has a processor operationally coupled to a memory and is configured to send a SIP message to a third network node via the second network node;
• wherein the second network node has a processor operationally coupled to a memory and is configured to:
• receive, from the first network node, the SIP message;
• determine routing information for forwarding the SIP message to the third network node based on information related to the third network node stored in a repository of the second network node;
• and
• generate a pivot request, which includes the routing information, to request that the first network node send the SIP message directly to the third network node without traversing the second network node so as to reduce a load on the SIP-based communications network;
• and
• send, to the first network node, the pivot request;
• wherein the first network node is further configured to:
• receive, from the second network node, the pivot request;
• and
• in response to receiving the pivot request:
• send, to the second network node, an acknowledgement of the pivot;
• and
• forward, directly to the third network node without traversing the second network node, the SIP message;
• and
• wherein the second network node is further configured to:
• receive, from the first network node, the acknowledgement of the pivot request;
• and
• in response to the acknowledgement, terminate a SIP server transaction model instance, that was initiated by the second network node responsive to receiving the SIP message, so as to refrain from remaining active in the SIP transaction.