CCME/CUE no ringback tone

[fblackfire]

Hi,

I have a Cisco CCME with a SIP-Trunk to an external provider. Incoming calls over this trunk are forwarded to a Cisco Unity Express IVR (running on a SRE), which - depending on the users DTMF choices - forwards the call to the chosen internal extension of the CCME. Everyhing is working fine, but the caller does not hear a ringback tone when the CUE forwards the call.

Any ideas where to look at or how to debug this?

The related CCME configuration:

dial-peer voice 2 voip
description ** IP SIP Trunk IN**
translation-profile incoming INCOMING_TRANSLATION_QUDO
session protocol sipv2
session target dns:xx.removed.com
session transport udp
incoming called-number 4...........
voice-class codec 11
no voice-class sip localhost
voice-class sip outbound-proxy ipv4:11.111.111.111
dtmf-relay rtp-nte
no vad
no supplementary-service sip moved-temporarily
no supplementary-service sip refer
!

dial-peer voice 9901 voip
description CUE
destination-pattern 9901
session protocol sipv2
session target ipv4:10.x.x.x
no voice-class sip outbound-proxy
dtmf-relay sip-notify
codec g711ulaw
no vad

voice class codec 11
codec preference 1 g722-64
codec preference 2 g711alaw
codec preference 3 g711ulaw
codec preference 4 ilbc
codec preference 5 g729r8

Many thanks for some hints!

[b.winter]

The best way to start is by providing more info like complete config (without any sensitive data) and debug output (like debug ccsip messages).

[fblackfire]

The config is very large. Which parts are of interest? I just would need a hint where to look at. Could it be a codec mismatch?

[Mohamed H. Abdelmotaleb]

Take debug CCSIP message logs from CCME and check where does the ringing back tone 180 stop ? 

[b.winter]

Yes, and provide the output here, so I (and others) can check the logs too.
Maybe there is an interworking issue, when the call is traversing CUE.
Do you have ringback, when you call a phone directly?

[fblackfire]

Yes, when I call the phones directly there is a ringback tone. I also have a ringback tone when I call the CUE from internal and it´s doing the forward. There is only no ringback tone when the call is coming over the mentioned SIP trunk to the CUE (when it forwards the call).