FAST METHOD OF INITIALIZING A CALL FOR AN APPLICATION OF PTT TYPE ON AN IP-WAN CELLULAR NETWORK

摘要

A method for initializing a call for a mobile terminal including PTT applications on an IP-WAN cellular network, the method including, for each user of the mobile terminal connected to an IP-WAN modem intended to register for a group call: upon starting up the IP-WAN modem, connecting the mobile terminal to the IP-WAN cellular network; when a PTT client is active and has obtained an IP address of a PTT server, initiating by the PTT client a procedure for registering a SIP with the PTT server on a default IP-WAN carrier; performing by the PTT client a procedure for affiliation to a call group with the PTT server on the default IP-WAN carrier, and as soon as the procedure for affiliation to the call group is performed, executing an “INVITE” (SIP) procedure to RTP resources at an application level on a PTT side and on the PTT client side, to allow the establishment of the RTP session after the affiliation of the PTT client to the group.

主权项

1. A method for initialising a call for a mobile terminal comprising applications of the PTT type on an IP-WAN cellular network, said method comprising, for each user of said mobile terminal connected to an IP-WAN modem intended to register for a group call:
a step, which is triggered on starting up the IP-WAN modern, during which is performed a procedure for connecting to the IP-WAN cellular network; a step in which, when a PTT client is active, and when it has obtained an IP address of a PTT server, the PTT client is able to instigate a procedure for registering a session initiation protocol (SIP) with the PTT server on a default IP-WAN carrier; a step in which, the PTT client proceeds to a procedure for affiliation to a call group with the PTT server on the default IP-WAN carrier, and a step in which, as soon as the procedure for affiliation to the call group is performed, an “INVITE” SIP procedure is executed to reserve RTP resources at an application level on a PTT side and on the PTT client side, in such a way as to allow the establishment of the RTP session immediately after the procedure of affiliation of the PTT client to the group.