Internet protocol address selection in session initiation protocol communications

A computing apparatus comprising:

• one or more non-transitory computer readable storage media;
• a processing system operatively coupled with the one or more non-transitory computer readable storage media;
• program instructions stored on the one or more non-transitory computer readable media to operate an end user communication device that, when executed by the processing system, direct the processing system to:
• receive a SIP invite from a first communication device;
• determine a source IP address for the computing apparatus, using an IP address for a second communication device as a destination address within a source address selection algorithm (SASA) function;
• add a Via header within the SIP invite to include the SASA determined source IP address for the computing apparatus;
• add a Record-Route header within the SIP invite to include the SASA determined source IP address for the computing apparatus;
• and
• transfer the modified SIP invite to the second communication device.

A communication system for operating a communication network utilizing a session initiation protocol (SIP) comprising:

• a first communication device;
• and
• a second communication device, coupled with the first communication device, wherein the second communication device is configured to:
• receive a SIP invite from a first communication device;
• determine a source IP address for the second communication device, using an IP address for a third communication device as a destination address within a source address selection algorithm (SASA) function;
• add a Via header within the SIP invite to include the SASA determined source IP address for the second communication device;
• add a Record-Route header within the SIP invite to include the SASA determined source IP address for the second communication device;
• and
• transfer the modified SIP invite to the third communication device.