calls not going to one specific phone

[GVB]

Hello,

I have a weird problem here.

We have several sites which have ubiquiti edgemax routers and the required VPNs inbetween.

On one site I placed 2 phones and configured them. But for some reason when dialing 1 specific phone you get on 5 attemps 4 times no dial tone and once it's dialing.

When I log into that fanvil phone I can call my phone which is on the main site without problems.

I enabled the setting "pbx handles audio" which was also required on the other site or sometime people couldn't hear eachother.

So the current situation is

3CX at 192.168.0.52
tel at 192.168.10.204


I have attached 2 wireshark images of captures started from on the fanvil phone.
the one with the most lines is my attempt to get a dial tone.

the other one shows that the package contains all the required server settings.

192.168.10.10 is the router where the phone is located.

any idea what else I could try/check?

 

[GVB]

here a dump of the activity log from a call that didn't succeed.

02/12/2020 1:12:34 PM - [CM503008]: Call(C:12873): Call is terminated
02/12/2020 1:12:34 PM - Leg L:12873.1[Extn:938] is terminated: Cause: CANCEL from 192.168.0.237:5060
02/12/2020 1:12:30 PM - [CM503025]: Call(C:12873): Calling T:Extn:213@[Dev:sip:[email protected]:5060] for L:12873.1[Extn:938]
02/12/2020 1:12:30 PM - [CM503027]: Call(C:12873): From: Extn:938 (<sip:[email protected]:5060>)  to  T:Extn:213@[Dev:sip:[email protected]:5060]
02/12/2020 1:12:30 PM - [CM503004]: Call(C:12873): Route 1: from L:12873.1[Extn:938] to T:Extn:213@[Dev:sip:[email protected]:5060]
02/12/2020 1:12:30 PM - [Flow] Call(C:12873): has built target endpoint: Extn:213 for call from L:12873.1[Extn:938]
02/12/2020 1:12:30 PM - [Flow] Target endpoint for 213 is Extn:213
02/12/2020 1:12:30 PM - [CM503010]: Call(C:12873): Making route(s) from Extn:938 to <sip:[email protected]:5060>
02/12/2020 1:12:30 PM - [CM505001]: Endpoint Extn:938: Device info: Device Not Identified: User Agent not matched; Capabilities:[reinvite, replaces, able-no-sdp, recvonly] UserAgent: [snomM300/04.00.0002 (MAC=0004136245D2; SER= 00000; HW=1)] PBX contact: [sip:[email protected]:5060]
02/12/2020 1:12:30 PM - [CM500002]: Call(C:12873): Info on incoming INVITE from Extn:938:

Invite-IN Recv Req INVITE from 192.168.0.237:5060 tid=wx0hrfawjerj6szii2mv00s [email protected]:

INVITE sip:[email protected]:5060;user=phone SIP/2.0

Via: SIP/2.0/UDP 192.168.0.237:5060;rport=5060;branch=z9hG4bKwx0hrfawjerj6szii2mv00s

Max-Forwards: 70

Contact: <sip:[email protected];line=39793>

To: <sip:[email protected]:5060;user=phone>

From: <sip:[email protected]:5060>;tag=8265641c

Call-ID: [email protected]

CSeq: 59240 INVITE

Allow: INVITE, CANCEL, BYE, ACK, REGISTER, OPTIONS, REFER, SUBSCRIBE, NOTIFY, MESSAGE, INFO, PRACK, UPDATE

Content-Disposition: session

Content-Type: application/sdp

Proxy-Authorization: Digest username="d27PRdIY04",realm="3CXPhoneSystem",nonce="414d535c14547cae35:15775a2e20feefecf0f25e8c410ca84f",uri="sip:[email protected]:5060;user=phone",response="db3925068e04b479e5cec40bc2999207",algorithm=MD5

Supported: replaces, 100rel

User-Agent: snomM300/04.00.0002 (MAC=0004136245D2; SER= 00000; HW=1)

Content-Length: 295



v=0

o=938 897560113 897560113 IN IP4 192.168.0.237

s=-

c=IN IP4 192.168.0.237

t=0 0

m=audio 50012 RTP/AVP 0 8 9 101

a=rtpmap:0 PCMU/8000

a=rtpmap:8 PCMA/8000

a=rtpmap:9 G722/8000/1

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

a=ptime:20

a=maxptime:80

a=sendrecv

a=rtcp:50013

02/12/2020 1:12:30 PM - [CM503001]: Call(C:12873): Incoming call from Extn:938 to <sip:[email protected]:5060>