Patent ID: 8363643
Filing Date: 2013-01-29
Classification: H04L

Abstract:
1. A method comprising: generating a session initiation protocol ‘SIP’ OPTIONS message at a push receiver agent, the SIP OPTIONS message configured to deliver the push receiver agent's capability to a push sender agent; including a contact header in the SIP OPTIONS message, the contact header including a push resource identifier feature tag containing a value of a push resource supported by the push receiver agent; including an allow header in the SIP OPTIONS message, the allow header including SIP methods supported by the push receiver agent; sending the SIP OPTIONS message that includes: a) the contact header with the push resource identifier feature tag containing the value of the push resource supported by the push receiver agent; and b) the allow header with the SIP methods supported by the push receiver agent to provide the push receiver agent's capability to the push sender agent; and receiving, relative to sending the SIP OPTIONS message, a SIP 200 OK response that includes: a) a contact header including a push resource identifier feature tag containing a value of a push resource supported by the push receiver agent which was specified in the SIP OPTIONS message; and b) an allow header containing SIP methods that the push sender agent supports.