SIP trunk between 3CX

[sysadminmz]

Following this thread: https://www.3cx.com/community/threads/sip-trunk-between-3cx.87251/#post-412471

I am able to make calls between 3CXs extensions, however, not able to router calls on one of them to PSTN.
Both trunks are Generic VOIP trunk, IP based.
3CX-A has a general outbound rule towards the trunk with remote 3CX-B.
3CX-B has an outbound rule towards the PSDN trunk.

INVITE message is received in 3CX-B as bellow:

03/23/2022 10:17:18 AM - [CM102001]: Authentication failed for AuthFail Recv Req INVITE from 3CX-A:5060 tid=f564e7724a18881d Call-ID=M0PQpp-9nWsPM00IZXQPeA..:
INVITE sip:845050110@3CX-B SIP/2.0
Via: SIP/2.0/UDP 10.0.1.3:5060;branch=z9hG4bK-524287-1---f564e7724a18881d;rport=5060;received=3CX-A
Max-Forwards: 70
Contact: <sip:3CX-A:5060>
To: <sip:845050110@3CX-B>
From: "Me"<sip:4321@3CX-A5060>;tag=354b711f
Call-ID: M0PQpp-9nWsPM00IZXQPeA..
CSeq: 2 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE, UPDATE
Content-Type: application/sdp
Proxy-Authorization: Digest username="",realm="3CXPhoneSystem",nonce="414d535c184b688d39:a8df75cb22cad401288c8312c1296ea9",uri="sip:845050110@3CX-B",response="865381a0367f0587fd183b8d9f2e8387",algorithm=MD5
Supported: replaces, timer
User-Agent: 3CXPhoneSystem 18.0.3.461 (461)
Content-Length: 282

v=0
o=3cxPS 400405037056 110746402817 IN IP4 3CX-A
s=3cxPS Audio call
c=IN IP4 3CX-A
t=0 0
m=audio 9024 RTP/AVP 0 8 18 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=sendrecv
; Reason: Credentials don't match, check that authorization-ID and password match the ones in extension settings

 

[Evolute IT]

Did you configure a bridge? That's the supported way of linking multiple 3CX together.

 

[sysadminmz]

Did you configure a bridge? That's the supported way of linking multiple 3CX together.

I am still running the 1 year free license and will leverage bridge configuration once the license is purchased. Until then, wanted to explore the SIP trunk between 3CX.

 

[Evolute IT]

I am still running the 1 year free license and will leverage bridge configuration once the license is purchased. Until then, wanted to explore the SIP trunk between 3CX.

Yeah well I would strongly recommend not bothering with the regular SIP trunks. It won't work because it's not meant for this at all.

Using bridges, what you want would work. We do that all the time.