Patent ID: 8014750

Claim:
A chassis that facilitates network connectivity comprising: a proxy-call session control function (P-CSCF) residing on the chassis, the P-CSCF including a first queue with at least one session initiation protocol (SIP) message and at least one non-call related message waiting for airlink availability, a second queue reserved for call session setup messages for emergency calls, and a third queue reserved for non-call related messages, wherein the call session setup messages in the second queue are placed on the airlink prior to the at least one SIP message and the at least one non-call related message in the first queue and wherein the non-call related messages in the third queue wait for airlink availability until the at least one SIP message in the first queue and the call session setup messages in the second queue are placed on the airlink; and wherein the P-CSCF is configured to: receive a session initiation protocol (SIP) call session setup request message for an emergency call; send a SIP Invite message to set up an emergency call with a public service answering point (PSAP); receive a call session setup message in response to the call session setup request message; place the call session setup message in the first queue for the airlink ahead of the at least one SIP message and the at least one non-call related message waiting in the first queue; and if the first queue is congested, place the call session setup message in the second queue for the airlink; and place the at least one non-call related message in the first queue into the third queue.