Configuring Call Preferences
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4. Enter the desired value in the DTMF Payload Type(96~127) field.
5. Click Confirm to accept the change.
To configure DTMF type for SIP account via web user interface:
1. Click on Account->SIP Account.
2. Select the desired value from the pull-down list of DTMF Type.
If SIP INFO or RFC2833+ SIP INFO is selected, select the desired value from the
pull-down list of DTMF Info Type.