该协议可以用于开始会话、邀请成员参加由其他方式做广告的会话，或者利用多点控制器开始多方通话。
The protocol may be used to initiate sessions, invite members to sessions advertised by other means or initiate multiparty calls using a multipoint control unit.
该协议可以用于开始会话、邀请成员参加由其他方式做广告的会话，或者利用多点控制器开始多方通话。
The protocol may be used to initiate sessions, invite members to sessions advertised by other means or initiate multiparty calls using a multipoint control unit.
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