Invention Grant
US07920520B2 Handoff between a SIP network and a cellular communication system 有权
SIP网络与蜂窝通信系统之间的切换

Handoff between a SIP network and a cellular communication system
Abstract:
Handoff between a wireless SIP network and a cellular communication system is provided. A system is designed to provide nomadic cellular services including voice to a SIP-enabled device.
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