Yealink SIP-T2 SERIES Administrator's Manual page 480

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
None
Phone User Interface:
None
features.dtmf.volume
Description:
Configures the frequency level of DTMF digits (in db).
Web User Interface:
None
Phone User Interface:
None
To configure DTMF type 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.
456
Parameters Permitted Values Default
Integer from -33
-10
to 0