Fast call set-up for multi-mode communication

Details Fast call set-up for multi-mode communication Fast call set-up for multi-mode communication

2007-01-09

2007-01-09

Appiah, Charles (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S426100, C455S435100, C455S435300, C455S445000, C455S552100, C455S553100, C370S338000

Reexamination Certificate

active

10831822

ABSTRACT:
Fast call set-up for a call to a multi-mode communication unit (102) is facilitated by a method and apparatus for registering and re-registering priorities with a SIP registrar (111). A list of contacts with first priorities associated with a mode of operation in a first enterprise network (106) is established and used. A switch to second priorities is made when a probability of a switch from the first mode of operation to a second mode of operation in a second cellular network (108) satisfies a threshold. The list of contacts includes a contact having an expiration time for the first mode of operation. A quality factor is determined and the list of contacts is re-registered and the expiration time changed if the quality factor does not satisfy a threshold.

REFERENCES:
patent: 6363260 (2002-03-01), Achour et al.
patent: 2001/0044305 (2001-11-01), Reddy et al.
patent: 2003/0217174 (2003-11-01), Dorenbosch et al.
patent: 2004/0030791 (2004-02-01), Dorenbosch et al.
patent: 2004/0102193 (2004-05-01), Kitami et al.
patent: 2004/0266426 (2004-12-01), Marsh et al.
patent: 2005/0135335 (2005-06-01), Hession et al.
patent: 2005/0136925 (2005-06-01), Yamauchi

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