Method, apparatus and system for transmitting a global text telephone signal

The present invention relates to communication technologies, and discloses a method, an apparatus, and a system for transmitting a signal to ensure normal communication between the calling party and the called party. The method includes: A first node sends Global Text Telephone (GTT) signal encoded in a Cellular Text Telephone Modem (CTM) format to a second node after the first node receives the GTT signal and if transmission between the first node and the second node is based on an Internet Protocol (IP) network. The present invention is primarily applicable to the GTT service.