Unable to make outbound calls.

[Jeremy_GS]

Log: failed, cause: Cause: 400 Invalid to number

I've rebuilt the sip trunk on both the 3cx server and the Amazon Chime side. I am able to receive calls. The outbound rules are setup to strip the first digit and prepend the +1. I was able to make calls the first day I set it up, and then... nothing.

 

[cobaltit]

If the 400 is coming from Amazon, then you don't have something setup right. Read (or re-read) the guide, check the logs and if you can't figure it out, open a ticket with Amazon support. If their support isn't helpful, then maybe try another provider who does have helpful support.

https://www.3cx.com/docs/amazon-chime-voice-connector-sip-trunk/