Yealink SIP-T54S Administrator's Manual page 922

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
Phone User Interface:
None
To configure the method of transmitting DTMF digits via web user interface:
Click on Account->Advanced.
1.
Select the desired account from the pull-down list of Account.
2.
Select the desired value from the pull-down list of DTMF Type.
3.
If SIP INFO or RFC2833 + SIP INFO is selected, select the desired value from the pull-
down list of DTMF Info Type.
Enter the desired value in the DTMF Payload Type(96~127) field.
4.
Click Confirm to accept the change.
5.
To configure the number of times to send the end RTP Event packet via web user
interface:
Click on Features->General Information.
1.
Select the desired value (1-3) from the pull-down list of DTMF Repetition.
2.
896
Parameters Permitted Values Default