Dual-tone multi-frequency signal transfer protocol

H - Electricity – 04 – M

Patent

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Details

H04M 11/06 (2006.01) H04L 29/06 (2006.01) H04Q 1/453 (2006.01)

Patent

CA 2218629

A handshake between sending and receiving devices (10) that exchange DTMF signals 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 set-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 digits of interest prefixed by M header 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 M header 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.

La transmission d'un message d'établissement de liaison entre des dispositifs d'émission et de réception (10) qui échangent des signaux DTMF via un réseau (14) est réalisée quand le dispositif de réception transmet durant un intervalle prescrit, après la réception d'un message d'établissement d'appel transmis par le dispositif d'émission qui a lancé l'appel, un signal DTMF indiquant qu'il est prêt à recevoir. € la réception de ce signal DTMF, le dispositif d'émission transmet au dispositif de réception un message de données incluant une chaîne de chiffres utiles précédés de M chiffres d'en-tête. Après avoir reçu une partie au moins de ce message de données, le dispositif de réception cesse la transmission du signal DTMF. Quand il a reçu tout le message de données, il élimine les chiffres de protocole (les M chiffres d'en-tête et tout signal DTMF reçu comme écho). En analysant les chiffres de protocole éliminés, on peut déterminer la qualité du message d'établissement de liaison entre les dispositifs de réception et d'émission.

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