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DTMF Issue in SIP

Hi All,


I have an issue here. The DTMF is not recognized by the Unity when user wants to do remote login to voicemail box by pressing *


Call Flow : T1 --> AS5400 --> SIP Trunk --> CUCM 9.1.2 --> SCCP --> CUC 9.1.2

Time : Nov 12 20:06:56.417 UTC

Calling Party Number i = 0x1183, '914466553077'
Called Party Number i = 0xA1, '2067677' - 99992067677

I can see in CCAPI, * being pressed and NOTIFY message is sent to CUCM, and I get 403 Forbidden as response.

The dial-peer configuration point to CUCM is below


dial-peer voice 4320 voip
 tone ringback alert-no-PI
 description --- PSTN  to XXX  9999.XXXXXXX ---
 preference 1
 destination-pattern 9999.......$
 no modem passthrough
 session protocol sipv2
 session target ipv4:XXXXX
 voice-class codec 1
 voice-class sip early-offer forced
 voice-class sip options-keepalive
 dtmf-relay sip-notify rtp-nte
 fax rate 7200
 ip qos dscp cs3 signaling
 no vad


Logs are attached. Please help me to find out the issue.


  • IP Telephony
Everyone's tags (2)

collect from as5400debug

collect from as5400

debug ccsip mess

Please check the attached

Please check the attached traces and debug.

Thank You

Cisco Employee

Enable “Accept Unsolicited

Enable “Accept Unsolicited Notification” under SIP Security Profile and test

Hi,We are not disabling it.


We are not disabling it. It's always checked and enabled.

Can we see the digit passing to the CUCM by the gateway in notify messages when UN is chosen?

Cisco Employee

remove rtp-nte in dial

remove rtp-nte in dial-peer

check mtp if not 

Kindly let me know why we

Kindly let me know why we need to remove from dial-peer. Per my understanding from the traces the CUCM negotiated to UN with the GW. How can we ensure * is passed to CUCM? 


Thank You

Cisco Employee

 Consume mask is not set.

 Consume mask is not set. Relaying Digit * to dstCallId 0x2B36E

VIP Super Bronze

Why are you using sip notify?

Why are you using sip notify? I suggest you remove sip notify and use only rtp-nte on that dial-peer. Ensure the sip trunk to gateway on cucm is set to use no preference for dtmf.

If you still have issues, consider using sip intergration between cuc and cucm. But sccp should work.

Please rate all useful posts "The essence of christianity is not the enthronement but the obliteration of self --William Barclay"

Hi, I have configured only



I have configured only rtp-nte on the dial-peer, trunk is already set to no preference. But it also did not work. I am not looking forward to change the integration to SIP between CUCM and Unity.

Did you get chance to go through the traces? Can we know if the digit (*) has forwarded to CUCM by the gateway in Notify?


Thank You.

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