The approach is instantiated on the SIP protocol described in Section 1.4.
该方法是采用SIP协议来实现如第1.4部分所述。
SIP is not attached to any particular conference control protocol.
SIP不依附于任何一种特定的会议控制协议。
SIP is not attached to and particular conference control protocol.
SIP不依附于任何一种特定的会议控制协议。
SIP is not attached to and particular conference control protocol.
SIP不依附于任何一种特定的会议控制协议。
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