Yealink VC400 Administrator's Manual page 152

Administrator's Guide for Yealink Video Conferencing Systems
Select the desired value from the pull-down list of DTMF Type.
3.
Click Confirm to accept the change.
4.
To configure DTMF type for H.323 via web user interface:
Click on Account->H.323.
1.
Select the desired value from the pull-down list of DTMF Type.
2.
Click Confirm to accept the change.
3.
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