CUCM Sip call Forwarding to Twilio external SIP domain

[erikCB]

hello
we are looking in CUCM 11.5 how to forward in sip calls from an internal number to a sip domain generated by twilio like 3349111111-phone-55555.sip.frankfurt.twilio.com which is in correspondence with only 1 of my telephone number.
we have created the sip trunk (with ip twilio), but I can't find how to configure the link (I think via URI) with this domain which corresponds to our number?
are you aware of these links to an external sip domain (with 1 unique domain per incoming number)?

[Roger Kallberg]

Sounds like you should have a look at B2B calling setup with Expressway. You can not create a SIP trunk to a random IP, as by the sound of your description is what you’re trying to do. Once you have B2B calling capability setup you can send the calls via this setup.

[erikCB]

Thanks Roger,
my problem is potentially simpler and without expressway (I think).
We just want to transfer a call to a single number on a CTI that is in the cloud (freshcaller with Twilio as operator). as an example, I dial 2001111 internally and we want to transfer the call to 332001111-phone-55555.sip.frankfurt.twilio.com which is of course on a fixed IP. the previous SIP domain name is unique.
We therefore thought that we needed a trunk to the twilio server and then provide the recipient SIP address 332001111-phone-55555.sip.frankfurt.twilio.com

[Roger Kallberg]

Even if you might think that this is simpler it’s not. You can not simply do what you outlined. There must be something on either side to form a trunk and simply because you create a trunk on your end it doesn’t mean that there is one on the other side.

[erikCB]

Thank you, maybe we can fire this without a trunc, I don't think so, but I hope:

I put an image of the request from the site.

[Roger Kallberg]

Without a trunk to carry the traffic you’ll need to have B2B calling capability in your system landscape. That’s what I referred in my original response. This requires Expressways to be setup and SIP uri routing to be configured in CM. Based on your questions so far I would recommend you to read up on the topic and if you still don’t fully understand what is needed that you reach out to a reputable Cisco system integrator for help with this.