Bouncing a call back off the Mitel fails.
The SIP trace shows you an error code of 630 Denied.
It would appear that Talk Talk and maybe other SIP providers do not allow you to send the original callers CLI to the destination.
To make the Trunk to Trunk calls work we had to change two options on the SIP peer profile.
The bottom two on these pictures had to be swapped no to yes and yes to no.
Top pic is it not working
Bottom pic is it working
