Solved Outbound proxy issue with Bandwidth

[FairviewJOwen]

Hello, this is my first post on the forum so forgive me if I leave anything out.

We recently got new outbound IP addresses from Bandwidth due to the stir/shaken compliance changes. We have a hot cut scheduled this Saturday to change over the inbound IP.

We currently host 55 phone systems through OVH, I took some time and changed all of the outbound IPs over to the new ones with bandwidth, they gave me two outbound IPs and I chose the nearest one as the primary, while using the other as the alternative proxy.

After the change, three of our phone systems cannot make outbound calls when the new IPs are entered. Two of the are some of our oldest systems, roughly 4-5 years, and one is one of the newest, made last month.

We have extensively cross referenced these systems with the other ones that are working, and we cannot find any differences.

If we replace the new IPs with what we were using before, these systems still work.

Bandwidth sent me an error report, but it is littered with our public IP addresses, and the forum advises against posting those in a thread, so I am unable to post the error info here.

I will post a snippet showing the nature of the error with the numbers removed in hopes that it will help give information about the issue. There is another portion to the info that Bandwidth sent me, but I did not see any errors in that bit.

SIP/2.0 400 Bad Request
Via: SIP/2.0/UDP <IP address>;branch=z9hG4bK-524287-1---7c25c229706b0e7e;rport=5060
From: <sipPhone#)@(IP Address)>;tag=20688e3a
To: <sipPhone#@(IP Address)>
Call-ID: Rec6TwPbMhYG426Z2W5YXA..
CSeq: 1 INVITE
Error-Info: <sipPhone#)@(IP address)>;cause="[line 014] SIP syntax error"
Content-Length: 0

Other info:
3cx version: 18.0 update 3 (Build 461)
Server OS: Debian 10
Hosted?: Yes, on OVH
using Bandwidth currently

 

[YiannisH_3CX]

Hi @FairviewJOwen

Looking at the error it looks like there is something Bandwidth does not like with the Invite sent to them.
Do inbound calls to the PBX work?

Try deleting and rebuilding the trunk by following this guide in case something was changed by accident: https://www.3cx.com/docs/us-sip-trunk-bandwidth/

 

[FairviewJOwen]

Inbound calls work, but we have not changed the inbound IP address yet, we are preforming a hot cut late evening this Saturday.

We have tried deleting and rebuilding the trunk to those specifications, and it has not helped.

 

[nextwave]

Did you get this to work? We are going through the same thing right now. Testing outbound calling but so far it always fails.

 

[FairviewJOwen]

Haven't found a solution yet, working with YiannisH_3CX via Private Message.

Currently, our system information is showing that our Bandwidth SIP Trunk was set up using a generic template instead of the Bandwidth template, but we definitely used the Bandwidth template to create it. I will post any significant updates on this thread to keep you in the loop.

 

[nextwave]

Our outbound is now working. Issue for us was on BW side. Once they whitlelisted our IP our outbound calls are now working.