Trunk to Trunk on Talk Talk SIP trunks fixed

[pmhaynes]

WE had an issue where when trying to do a trunk to trunk on Talk Talk SIP trunks the call would fail.
From the trace we could see the outgoing leg of the call was being denied.
I Wireshark trace shows error code 630 denied

We found if we made these changes the Trunk to Trunk worked fine
On the SIP peer profile set
Use diverting party number as calling party number to YES
and
Use original calling party number if available to NO

To me this sounds like Talk Talk wont allow the original callers cli to be presented to the final destination.

Does the forum agree?

Thanks for any imput

MY blog with pictures of changes
http://phonesystemhelp.info/fix-trunk-to-trunk-calls-fail-on-talk-talk-sip-trunks-error-630/

[sarond]

Yes that sound correct to me.

We have the same issue with one of our providers, they will not allow the original CLI to be passed through.

[x-man]

Same applies to PRI/BRI as well. Always has in the UK as far as I know. Its n antifraud/scam scenario IIUIC. You can overcome it by getting the provider to allow it but you have to fill in some kind of form and give a good reason for wanting to do it in the first place.