Reducing size of messages over the cellular control channel

摘要

Methods and apparatus for initiating a PTT call from a caller client device to a recipient client device. The methods and apparatus register the caller client device with the PTT system, wherein caller data identifying the caller client device is transmitted to the PTT system; store the caller data; generate, at the caller client device, a channel request message comprising channel allocation data and call invite messaging information; transmit the channel request message to the PTT system; parse the call invite messaging information from the channel request message; generate a call invite message based upon the call invite messaging information and the stored caller data; and establish the PTT call between the caller client device and the recipient client device based upon the call invite message. Additionally, the call invite messaging information includes an identification number and not the URI of the recipient client device.

主权项

1. A method for initiating a push-to-talk (PTT) call from a caller client device to a recipient client device in a cellular network, said method comprising:
registering said caller client device with a PTT over cellular (PoC) server using an enhanced registration request (RRQ) message, wherein said enhanced RRQ message is created by adding a binary session initiation protocol (SIP) invite message in a registration request message; storing at least one data identifying said caller client device at a call session control function (CSCF) in a server, wherein said at least one data includes at least one of a caller client device ID, and caller client device capabilities; initiating a call set up from said caller client device with said recipient client device using said binary SIP invite message; parsing said binary SIP invite message from said enhanced RRQ message at a router in said cellular network; receiving a parsed binary SIP invite message at said CSCF in said server from said router; reconstructing a standard SIP invite message using a received parsed binary SIP invite message and stored data associated with said caller client device at said CSCF in said server; transmitting said standard SIP invite message from said CSCF in said server to said PoC server; and establishing said PTT call between said caller client device and said recipient client device based upon information received in said standard SIP invite message.