| 摘要 |
A handshake between sending and receiving devices (10) that exchange DTMF signal across a network (14) is accomplished by having the receiving device send a DTMF ready tone (digit) for a prescribed interval following receipt of a call sept-up message received after the sending device has initiated a call. Upon receipt of the DTMF ready digit, the sending device sends to the receiving device a data message includes a string of digit of interest prefixed by Mheader digits. After receiving at least a portion of the data message, the receiving device stops transmitting the ready digit, Once the receiving device has received the entire data message, the receiving device strips the protocol digits (the Mheader digits and any of the ready digits received due to echo). By analyzing the stripped protocol digits, the quality of the handshake between the receiving and sending devices can be determined.
|
