Yoda VP306 Quick Installation Manual page 39

DTMF Settings
8.70. You can setup the options for DTMF function in this page. The options include RFC2833 (Outband
DTMF), Inband DTMF, and Send DTMF SIP info. If you are making two-stage callings for
extension to PSTN, you might need to select RFC2833 DTMF option.
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