Dual IP phone and method of telecommunicating by using the same

Details Dual IP phone and method of telecommunicating by using the same Dual IP phone and method of telecommunicating by using the same

2007-01-30

2007-01-30

Tsang, Fan (Department: 2614)

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

C379S093050, C370S354000, C455S420000

Reexamination Certificate

active

10621468

ABSTRACT:
A dual phone, and method of telecommunicating by using the same, have an ISDN phone and IP phone. The dual phone recognizes one of ISDN mode, IP mode, and external connection mode from a user input, and connects or releases a voice path between an ISDN phone and the IP phone based on the recognized mode, thereby enabling calling between an external ISDN phone and an IP phone.

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