No RBT but AUDIO ok

[toro_dlp]

Hi everyone,
I have an OXE Crystal with one Gateway GSM-SIP. This OXE is on ABC nwt.
When I call, using this Gw_GSM-Sip (with her Sip Trunk) i haven´t got ringback tone (RBT) but the conversation it´s established, and the audio it´s OK.

I was thinking, the cause it was the Gw_GSM-Sip or OXE configuration, but:
- if call using other OXE (on the ABC ntw) with this remote trunk group (with same configuration), without sipmotor, I have RBT!
Then I thought it was problem with hardaware Crystal but:
- I have a hardware common on the same OXE.

I had been changed sip msg (183 x 180), codecs in both side, and no had any solution.
I have be noted that the audio on call it´s OK.
Thanks for any msgs..
Regards..

[giovanni.attolini]

Let me understand:

- If you call from the ABC ntw using that remote SIP trunk you have RBT;
- If you call directly from OXE where there is the SIP trunk you don't hve RBT;

Am I correct?

[toro_dlp]

yes!

[giovanni.attolini]

Ok, in this case, I am not shure but who is in charge to RBT is SIP_GW, have you verified the configuration?
When OXE is acting like transit she generate RBT, when you access SIP_GW thrunk directly, he must generate RBT.