Transport of DTMF tones over VOATM/VOIP networks
    2.
    发明授权
    Transport of DTMF tones over VOATM/VOIP networks 有权
    通过VOATM / VOIP网络传输DTMF音

    公开(公告)号:US07486665B2

    公开(公告)日:2009-02-03

    申请号:US10994559

    申请日:2004-11-22

    IPC分类号: H04L12/66 H04J3/12

    摘要: A communication device, such as a Voice over Internet Protocol (VoIP) gateway, determines a duration for Dual Tone Multi-Frequency (DTMF) tone portions of telephony signal. If the duration is less than a pre-determined amount, a minimum duration is enforced during DTMF playback at a remote end of a network connection connected to a destination gateway. Minimum playback duration can be enforced at the terminating gateway—however, the originatinggateway can also encode a DTMF packet with a minimum duration value. At the terminating receiver it is not always possible to playback exactly what happened at the originating point in the same time frame. One solution to is to, at the terminating gateway, drop the first portion of voice packets that overlap with the end portion of played back DTMF tones.

    摘要翻译: 通信设备,例如因特网协议语音(VoIP)网关,确定电话信号的双音多频(DTMF)音部分的持续时间。 如果持续时间小于预定的量,则在连接到目的地网关的网络连接的远程端的DTMF回放期间执行最小持续时间。 最终重放持续时间可以在终端网关上实施 - 然而,发起端口也可以对具有最小持续时间值的DTMF分组进行编码。 在终端接收机处,并不总是可以在同一时间帧内准确地回放起始点发生的事件。 一种解决方案是在终端网关处丢弃与回放DTMF音调的末端部分重叠的语音分组的第一部分。