Solved 3CX Teams Direct Routing - Incoming call rejected, caller is unknown

[ishost]

Hi everyone,

Looking for some help please, I have setup Teams Direct Routing and incoming calls are working fine but when I try calling from Teams (Internal and External) I call gets rejected and the logs show the below error.

Any help would be great.

Thank you

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04/08/2021 16:43:29 - [CM503013]: Call(C:53): Incoming call rejected, caller is unknown; msg=Invite-IN Recv Req INVITE from 52.114.76.76:8832 tid=bae4e9d4 Call-ID=0809ce892de85ef9a61bf63dc16e48d7:
INVITE sip:[email protected]:5062;user=phone;transport=tls SIP/2.0
Via: SIP/2.0/TLS 52.114.76.76:5061;branch=z9hG4bKbae4e9d4
Max-Forwards: 70
Record-Route: <sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr>
Contact: <sip:api-du-a-euno.pstnhub.microsoft.com:443;x-i=b80e9021-0de0-4f02-9464-a8c17a6faf73;x-c=0809ce892de85ef9a61bf63dc16e48d7/d/8/97fbacb638a64e509849c7b56a2854a4>
To: <sip:[email protected]:5062;user=phone>
From: <sip:[email protected]:5061;user=phone>;tag=f16ec22536424982b7a656dea54883a1
Call-ID: 0809ce892de85ef9a61bf63dc16e48d7
CSeq: 1 INVITE
Session-Expires: 3600
Min-SE: 300
Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, NOTIFY
Content-Type: application/sdp
Supported: timer
User-Agent: Microsoft.PSTNHub.SIPProxy v.2021.8.2.5 i.EUNO.3
Privacy: id
P-Asserted-Identity: <tel:+44DDI;ext=4001>
P-Asserted-Identity: <sip:[email protected]>
Content-Length: 1101

v=0
o=- 101187 0 IN IP4 127.0.0.1
s=session
c=IN IP4 52.113.43.58
b=CT:10000000
t=0 0
m=audio 49568 RTP/SAVP 104 9 103 111 18 0 8 97 101 13 118
c=IN IP4 52.113.43.58
a=rtcp:49569
a=ice-ufrag:L/AN
a=ice-pwdB5oy+EEwVIvDSgJcYexVanP
a=rtcp-mux
a=candidate:1 1 UDP 2130706431 52.113.43.58 49568 typ srflx raddr 10.0.136.185 rport 49568
a=candidate:1 2 UDP 2130705918 52.113.43.58 49569 typ srflx raddr 10.0.136.185 rport 49569
a=candidate:2 1 tcp-act 2121006078 52.113.43.58 49152 typ srflx raddr 10.0.136.185 rport 49152
a=candidate:2 2 tcp-act 2121006078 52.113.43.58 49152 typ srflx raddr 10.0.136.185 rport 49152
a=label:main-audio
a=mid:1
a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:FCX0Q22HpQ9wNsB+A9Vvp/C6lZdwgdOjNhRPD1Q6|2^31
a=sendrecv
a=rtpmap:104 SILK/16000
a=rtpmap:9 G722/8000
a=rtpmap:103 SILK/8000
a=rtpmap:111 SIREN/16000
a=fmtp:111 bitrate=16000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:97 RED/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtpmap:13 CN/8000
a=rtpmap:118 CN/16000
a=ptime:20

 

[Evolute IT]

Did you use the right dial plan for your country?

 

[ishost]

Yeah I have UK dial plan, I have tested the translation in the Teams portal and it’s shows the correct plan.

Also the internal extensions dont work and that’s showing correct too

3CX is showing that the call is being “rejected” because the “caller is unknown” it also shows “rejected” in Teams when I make a call

 

[ishost]

Fixed it

Make sure you don’t have a “Caller ID” policy set within MS Team Admin Centre. I don’t remember setting this but it was enabled to call out on a service number.

I just turned this off and waited 10 mins and all is working now

I hope this helps someone out there because it had me baffled for hours.

 

[ChrisC_3CX]

@ishost
Thank you for sharing your solution!

I'm sure this will prove helpful to people facing the same issue!