System, method and computer program for changing over between a voice transmission and a fax transmission

摘要

To switch back a fax transmission in line with T.38 to a voice transmission over an IP network, the invention proposes transferring the transmission data stored in the media gateway controller at a first end to the media gateway controller at a second end over a signaling network. Thereby, causing the codecs in the media gateway at the second end and the media gateway at the first end to be switched back together.