Yealink SIP-T4X Administrator's Manual page 137

If SIP INFO or AUTO or SIP INFO is selected, select the desired value from the
pull-down list of DTMF Info Type.
5. Enter the desired value in the DTMF Payload Type (96~127) field.
6. Click Confirm to accept the change.
To configure the number of times to send the end RTP Event packet via web user
interface:
1. Click on Features->General Information.
2. Select the desired value (1-3) from the pull-down list of DTMF Repetition.
3. Click Confirm to accept the change.
Configuring Basic Features
121