Asterisk outbound configuration with Twilio fails

Asterisk Asterisk SIP
1

I have set up my Twilio account to receive outbound calls from my asterisk sip server.

I have made a registration request as per the docs

register => <user>:<password>@<termination_uri>.pstn.us1.twilio.com

These are the log from sip set debug on

Retransmitting #2 (no NAT) to 54.172.60.3:5060:
REGISTER sip:<termination_uri>.pstn.us1.twilio.com SIP/2.0
Via: SIP/2.0/UDP <sip_server_ip>:5060;branch=z9hG4bK4f338547
Max-Forwards: 70
From: <sip:<user>@<termination_uri>.pstn.us1.twilio.com>;tag=as655fbd71
To: <sip:<user>@<termination_uri>.pstn.us1.twilio.com>
Call-ID: 44b6bf8f0421dd862f704bdd37efb675@10.128.0.12
CSeq: 104 REGISTER
Supported: replaces, timer
User-Agent: Asterisk PBX certified/13.21-cert2
Expires: 120
Contact: <sip:s@<sip_server_ip>:5060>
Content-Length: 0

The request fails to go through even after multiple retries, sip show registry shows:

Host                                    dnsmgr Username       Refresh State                Reg.Time                
 
<termination_uri>.pstn.us1.twilio.com:5060    N      666                120 Request Sent                                 
 
1 SIP registrations.
2

Your log is excessive obfuscated. One cannot distinguish between public and private addresses. My suspicion is that this is a NAT issues.

I assume that your SIP server and SIP client have the same address. Asterisk is operating as a client when issuing the register, but the intent of register is to supply an address to use when it is is the initial server.

3

The <sip_server_ip> is the public address :slight_smile:
I just tried with a different provider nexmo and it seems to work with them? following these docs

4

A SIP server should respond to even invalid SIP requests. That strongly suggests that something is stopping the replay getting back to Asterisk.

5

You dont need to user registration string to recive inbound calls with Twilio Elastic trunk, Twilio will send the calls to a valid SIP uri, specified on the Origination Tab