User Agent(UA) is developed based on the source coeds of Vocal in Session Initiation Protocol(SIP). SIP is an application-layer protocol,that can establish, modify and terminate multimedia sessions(conferences),such as internet telephony calls. we modify the source codes of Vocal mainly on repairing some bugs,and add our own understanding to SIP. we add a module,,called media manager, to manage the various media form, and it makes it easier to add or delete a media stream when the session is acting.
 
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