Re: SIP endpoint 3911 on UC520 cannot send DTMF to outside call
dial-peer voice 6800 voip
session protocol sipv2
session target ipv4:126.96.36.199
The equivalent method in the SIP domain is to use a SIP NOTIFY event. However, this is not well standardized. The original SIP DTMF NOTIFY implemented in the Cisco IOS Voice Gateway software is based on an early draft proposal for this mechanism and, therefore, is not supported on most third-party SIP products. However, this mechanism is adequate provided that you are using only Cisco IOS voice endpoints with Cisco IOS Release 12.3(4)T or later. You also need to transport DTMF keypad events across VoIP to an IOS PSTN voice gateway for regeneration as an audio signal into a PSTN trunk or FXS port.
To enable the SIP NOTIFY for dtmf-relay, add the following command to your SIP VoIP dial peers:
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