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TRP SRTP DTMF issue

wimarques
Level 1
Level 1

Dear community,

 

I recentely faced an issue where DTMF didn't work while trying to involve anTRP in the following call flow:

Jabber --srtp--TRP --srtp--- CUCM Conference now IP IVR

 

I've made some tests and I came to the conclusion that TRP is not able to decrypt properly DTMF SRTP events.

Jabber ----srtp------ CUCM IP IVR works fine

Jabber ----rtp---TRP---rtp--- CUCM IP IVR works fine

Jabber ----srtp---TRP---srtp--- CUCM IP IVR doesn't work

 

TRP is forced on jabber side only.

DTMF debug on ISR4K shows irelevant RTP-NET DMTV Events (138, 183, 234, ....)

 

Since the destination is DTMF OOB only, TRP must decrypt the SRTP DTMF Events in order to notify them through SCCP.

I was unable to find any document stating if MTP/TRP supports SRTP DTMF decryption.

 

Thanks for your help

 

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