Configuration procedure

1. Enter system view.

system-view

N/A

2. Enter voice view.

voice-setup

N/A

3. Set the duration of monitoring DSP buffered data.

vqa dsp-monitor buffer-time time

Optional.

By default, the duration of monitoring DSP buffered data is 270 milliseconds. If the duration is set to 0, buffered data will not be monitored.

Duration greater than 240 milliseconds is recommended because too small a duration value will result in poor voice quality in the case of severe jitter.

4. Set the DSCP subfield in the ToS field in the IP packets that carry the RTP stream or voice signaling.

vqa dscp { media | signal } dscp-value

Optional.

The default is 101110.

5. Set the time duration for switching from the current VoIP link to another VoIP link or a PSTN link (that is, the call backup switching time) in case of a VoIP call failure.

voip timer voip-to-pots time

Optional.

The default is 5 seconds.

6. Configure the type of the DSP image.

vi-card dsp-image { ms | general }

The default is the general version.

The general version supports the G.723 codec, but it cannot meet voice quality requirements of Microsoft. The ms version can meet voice quality requirements of Microsoft, but it does not support the G.723 codec.

7. Configure the maximum number of call history records that can be stored.

call-history max-count number

Optional.

50 by default.