Yealink SIP-T21 E2

Configuring Audio Features
903
Parameter
Permitted Values
Default
during a call.
Web User Interface:
Features->General Information->Play Local DTMF Tone
Phone User Interface:
None
To configure play local DTMF tone via web user interface:
1. Click on Features->General Information.
2. Select the desired value from the pull-down list of Play Local DTMF Tone.
3. Click Confirm to accept the change.
Voice Quality Monitoring (VQM)
Voice quality monitoring feature allows the IP phones to generate various quality metrics for
listening quality and conversational quality. These metrics can be sent between the phones in
RTCP-XR packets. These metrics can also be sent in SIP PUBLISH messages to a central voice
quality report collector. Two mechanisms for voice quality monitoring are supported by Yealink
IP phones:
 RTCP-XR
 VQ-RTCPXR