The present invention relates to a method and system for establishing a connection to a terminal device, wherein a user capability information defining supported types of information streams is set in a compatibility information element within an outband signaling message, and a capability negotiation...http://www.google.es/patents/US7330542?utm_source=gb-gplus-sharePatente US7330542 - Method and system for establishing a multimedia connection by negotiating capability in an outband control channel
Method and system for establishing a multimedia connection by negotiating ...
