| 摘要 |
<p>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. <IMAGE></p> |
