Unidentified Incoming Call

[Outsourcing]

Hi,

We have a 3CX could system , with SIP truck configured to forword all the incoming call to an external number based on the caller ID , last week every thing working grate , this monday we are facing this error message :

Event Log​

Severity	Warning
Event ID	30051
Date	10/27/2025 1:29 PM
Details	Unidentified Incoming Call. Review INVITE and adjust source identification:. INVITE sip:+XXXXX@XXXXXX:5060 SIP/2.0. Via: SIP/2.0/UDP 188.94.184.98;branch=z9hG4bK2506.11cd331c87f3a9f5153d5ef4556b5f59.0. Via: SIP/2.0/UDP XXXXX;received=XXXXXX;rport=5060;branch=z9hG4bK7010vZ4pX45ap. Max-Forwards: 19. Record-Route: <sip:188.94.184.98;lr=on;ftag=3N50yaU4gXr2K;did=4ea.1411>. Contact: <sip:gw+vp-i10router11@XXXXX:5060;transport=udp;gw=vp-i10router11>. To: <sip:+XXXXX@XXXXXX:5060>. From: "XXXXXXXX" <sip:+XXXXXXXXX@XXXXXXXX>;tag=3N50yaU4gXr2K. Call-ID: c8130210-d570-43d0-9d3c-26df82e5b1d0. CSeq: 106230292 INVITE. Session-Expires: 1800;refresher=uac. Min-SE: 90. Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REFER, NOTIFY. Content-Disposition: session. Content-Type: application/sdp. Supported: timer, path, replaces. User-Agent: CMSBC. Allow-Events: talk, hold, conference, refer. Privacy: none. P-Asserted-Identity: <sip:+XXXXX@1XXXXXX>. Content-Length: 249. v=0. o=SBC02N1MND 130760762498718 130760762498718 IN IP4 XXXXXX. s=-. c=IN IP4 XXXXXXX. t=0 0. m=audio 24946 RTP/AVP 8 101. a=rtpmap:8 PCMA/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-15. a=sendrecv. a=rtcp:24947. a=ptime:20

all the IP address were add as Allow , but we still receiving the same message

Can you please advise for this situation .

Regards

 

[NikosT_3CX]

@Outsourcing as a frist step if the numbers on the FROM and the TO are real, remove them from the thread.
Also as I can see this has " User-Agent: CMSBC " . Who is the provider you are using ?
Is this a Generic one ?
Also ensure that the TO that the Provider sends exists as a DID on the PBX side with the same format.

 

[Outsourcing]

@Outsourcing as a frist step if the numbers on the FROM and the TO are real, remove them from the thread.
Also as I can see this has " User-Agent: CMSBC " . Who is the provider you are using ?
Is this a Generic one ?
Also ensure that the TO that the Provider sends exists as a DID on the PBX side with the same format.

Hi, all sensitive information were masked , the provider is CM.com