BRIEF DESCRIPTION OF THE DRAWINGS
The exemplary aspects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings wherein:
FIG. 1 is a block diagram showing a configuration of an IP telephony system according to an embodiment mode of the present invention;
FIG. 2 is a block diagram showing a configuration of a VoIP terminal according to a first embodiment of the present invention;
FIG. 3 is a flowchart showing an operation of exchanging a value of a self reboot waiting timer performed by the VoIP terminal according to the first embodiment of the present invention;
FIG. 4 is a first sequence chart showing an operation performed when an abnormality is detected in the VoIP terminal according to the first embodiment of the present invention;
FIG. 5 is a second sequence chart showing an operation performed when an abnormality is detected in the VoIP terminal according to the first embodiment of the present invention; and
FIG. 6 is a sequence chart showing an operation performed by a VoIP terminal when an abnormality is detected in an MGC, according to a second embodiment of the present invention.