Patent ID: 9509724
Filing Date: 2016-11-29
CPC Classification: H04L,H04W

Claim Text:
1. A method of handling Session Initiation Protocol messages in a wireless telecommunications device configured to use Session Initiation Protocol in communication with at least one other telecommunications device, wherein the device comprises: a modem subsystem configured to deploy Internet Protocol Multimedia Subsystem services using Session Initiation Protocol and comprising a Session Initiation Protocol stack for exchanging Session Initiation Protocol messages between Internet Protocol Multimedia Subsystem services on the modem subsystem and an external Session Initiation Protocol proxy server; and an application processing engine configured to deploy Internet Protocol Multimedia Subsystem services using Session Initiation Protocol and comprising a Session Initiation Protocol stack for exchanging Session Initiation Protocol messages between Internet Protocol Multimedia Subsystem services on the application processing engine and the external Session Initiation Protocol proxy server, wherein the method comprises the steps of: capturing Session Initiation Protocol messages from Internet Protocol Multimedia Subsystem services to the external Session Initiation Protocol proxy server in a logical element configured to function as a Session Initiation Protocol Back-to-Back User Agent with a Session Initiation Protocol stack connected to the Session Initiation Protocol stacks of the modem subsystem and the application processing engine and to the external Session Initiation Protocol proxy server; and sending from said logical element to the external Session Initiation Protocol proxy server Session Initiation Protocol messages based on said captured Session Initiation Protocol messages.