移去轮挡，终止通话，从左(右)侧给手势，可以滑出，再见。
Chocks cleared, stop calling, hand signals from left (right), taxi out, Good-bye.
SIP支持建立和终止多媒体通信的五个方面：用户定位、能力与可用性、通话建立和通话处理。
SIP supports five facets of establishing and terminating multimedia communications: user location, capabilities and availability, call setup and call handling.
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