| 摘要 |
Fax and modem connections are usually treated in the same way as voice connections by the network nodes during connection setup. By using the disabling tone, fax modems having integrated echo compensation deactivate echo compensators which are provided on the network side. Packet-switched transport networks are generally unable to transmit this tone perfectly. In order to regain the full functionality of a circuit-switched network, a media gateway is proposed which contains a tone disabler, a tone generator and an additional tone disabler, which allow an echo compensator to be controlled in the direction of the packet network and allow both an echo compensator to be controlled in the direction of the circuit-switched network and the disabling tone to be reproduced in the direction of the circuit-switched network.
|
