No inbound calls using V15 with Twilio Trunk

[DavidB]

Setting up a new system and extension to extension works fine. Outbound calls work but inbound calls fail. Firewall test passed. Using wireshark, I can see the SIP "invite" from Twilio but 3CX responds with Status-Line: SIP/2.0 407 Proxy Authentication Required. I have read the 3CX - Twilio setup doc - but it appears to be for an earlier version of 3CX... the options listed don't seem to exist in v15. I suspect something the SIP Trunk - Inbound Parameters needs tweaked but have to idea how to debug this issue.

 

[YiannisH_3CX]

Hello @DavidB

Is there any response from Twilio after the SIP/2.0 407 Proxy Authentication Required ? Are you then seeing a re-invite? Also is it an IP based trunk or an authentication based one? What service pack are you currently running of V15?
Do you have more than one trunk on the system?

 

[DavidB]

Issue was finally resolved. The inbound DiD number must be in E164 format. I cannot be 100% sure, but I believe I entered the number in E164 format and it was converted to a (xxx) xxx-xxxx format at some point.

Also the SIP Trunk - InBound Parameters setting page was confusing... but this worked
"Look for the DID number in these fields"
User Agent: Text String
Custom Field
Twilio Gateway

Thanks to all that replied and messaged me with helpful hints.

 

[zyrk]

I can't get Twilio to work with 3CX v15. I tried DavidB sugguestions but it is still not working. Any help will be greatly appreciated.

Thanks!

 

[StefanW]

"Look for the DID number in these fields"

I have them working, place this combo into the lookup

From Host Part
GWHostPort

In the documentation I saw that XXXX.pstn.twilio.com is sent always in this part. If this still does not work re-validate the settings where the call is send to in the twillio user interface