Voice-over IP mobile roaming using SIP refer

Details Voice-over IP mobile roaming using SIP refer Voice-over IP mobile roaming using SIP refer

2008-01-01

2008-01-01

Smith, Creighton (Department: 2614)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C370S331000

Reexamination Certificate

active

10736140

ABSTRACT:
Within a mobile communications device, a method of roaming between a mobile network and a wireless network can include establishing a Voice-Over Internet Protocol communications link with an endpoint over which a call is conducted, wherein at least a portion of the call is conducted over the wireless network. The method further can include initiating a handoff of at least a portion of the call from the wireless network to the mobile network using a Session Initiation Protocol refer method and continuing the call using the mobile network for at least a portion of the call rather than the wireless network.

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