METHOD OF CHANGING MOBILE VOICE TELEPHONY SERVICE FROM MOBILE VIDEO TELEPHONY SERVICE AND MOBILE VIDEO TELEPHONY SERVICE FROM MOBILE VOICE TELEPHONY SERVICE

摘要

The alternating conversion method of image call and voice call is arranged to image call to be converted to voice call, will not cut away voice call during image call between the terminals. The state that call forwarding request is formed between originating terminal (110) and receiving end (170) in image call channel is received from originating terminal. Voice call conversion of one mobile switching center (130) request on the target side once connected. The voice bearer channel taken on the telephone between originating terminal and receiving end is set up. Transmission steady improvement in receiving end becomes voice call to mobile switching center state.