T.38 Fax Setup

Hi
Please can somebody help with the T.38 fax? Its a HP MFP with T38 fax enabled.

I can see that auth isnt the problem and the PBX replies with an OK message - in the registration settings, it just always shows as unavail.

Settings on the fax machine are as follows:
SIP Transport Method

  • UDP - this is selected
  • TCP
  • TLS

Invite Media Preference

  • PCMU
  • PCMA
  • T.38 - this is selected

Re-invite Media Preference

  • PCMU
  • PCMA
  • T.38 - this is selected

Registrar Server
10.11.250.1 - ip of the PBX

Registrar Port
5060

(1-65535)
User Name
Auth User Name
1611 - an extension on the system

Password - looks ok from the logs below.

Below is the SIP logs between the PBX and the fax:

<— Received SIP request (443 bytes) from UDP:10.11.37.59:5060 —>
REGISTER sip:10.11.250.1:5060 SIP/2.0
Via: SIP/2.0/UDP 10.11.37.59:5060;rport;branch=z9hG4bKPjf07a39a9d55fd83feb7fb61f29b6d212
Max-Forwards: 70
From: sip:[email protected];tag=a3acb29505e83c62ceda60e08f94e544
To: sip:[email protected]
Call-ID: 69b9da45f4559a922b36a273d26ae4d1
CSeq: 48391 REGISTER
Contact: sip:[email protected]:5060;+sip.fax=“t38”
Expires: 60
Allow: INVITE, ACK, BYE, CANCEL, UPDATE, PRACK
Content-Length: 0

<— Transmitting SIP response (550 bytes) to UDP:10.11.37.59:5060 —>
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 10.11.37.59:5060;rport=5060;received=10.11.37.59;branch=z9hG4bKPjf07a39a9d55fd83feb7fb61f29b6d212
Call-ID: 69b9da45f4559a922b36a273d26ae4d1
From: sip:[email protected];tag=a3acb29505e83c62ceda60e08f94e544
To: sip:[email protected];tag=z9hG4bKPjf07a39a9d55fd83feb7fb61f29b6d212
CSeq: 48391 REGISTER
WWW-Authenticate: Digest realm=“asterisk”,nonce=“1600937414/ba56486343a4dadb719a7a5248c3680e”,opaque=“4fc5bd1b7ff2fb78”,algorithm=md5,qop=“auth”
Server: FPBX-15.0.16.75(16.11.1)
Content-Length: 0

<— Received SIP request (734 bytes) from UDP:10.11.37.59:5060 —>
REGISTER sip:10.11.250.1:5060 SIP/2.0
Via: SIP/2.0/UDP 10.11.37.59:5060;rport;branch=z9hG4bKPj2ca84de9b1ac8d05aa75b8a8547a80cd
Max-Forwards: 70
From: sip:[email protected];tag=a3acb29505e83c62ceda60e08f94e544
To: sip:[email protected]
Call-ID: 69b9da45f4559a922b36a273d26ae4d1
CSeq: 48392 REGISTER
Contact: sip:[email protected]:5060;+sip.fax=“t38”
Expires: 60
Allow: INVITE, ACK, BYE, CANCEL, UPDATE, PRACK
Authorization: Digest username=“1611”, realm=“asterisk”, nonce=“1600937414/ba56486343a4dadb719a7a5248c3680e”, uri=“sip:10.11.250.1:5060”, response=“57f3765285940c47322d7d22dc2dacfa”, algorithm=md5, cnonce=“01b3dc3ade080b90020c61a08ed917d7”, opaque=“4fc5bd1b7ff2fb78”, qop=auth, nc=00000001
Content-Length: 0

<— Transmitting SIP response (493 bytes) to UDP:10.11.37.59:5060 —>
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.11.37.59:5060;rport=5060;received=10.11.37.59;branch=z9hG4bKPj2ca84de9b1ac8d05aa75b8a8547a80cd
Call-ID: 69b9da45f4559a922b36a273d26ae4d1
From: sip:[email protected];tag=a3acb29505e83c62ceda60e08f94e544
To: sip:[email protected];tag=z9hG4bKPj2ca84de9b1ac8d05aa75b8a8547a80cd
CSeq: 48392 REGISTER
Date: Thu, 24 Sep 2020 08:50:14 GMT
Contact: sip:[email protected]:5060;expires=59
Expires: 60
Server: FPBX-15.0.16.75(16.11.1)
Content-Length: 0

<— Transmitting SIP request (631 bytes) to UDP:10.11.37.59:5060 —>
NOTIFY sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.11.250.1:5060;rport;branch=z9hG4bKPja68f1dbe-d255-4157-b42b-4a0f095c7fb7
From: sip:[email protected];tag=5b7adfa0-3d1e-4a3d-9425-70398a97fc20
To: sip:[email protected]
Contact: sip:[email protected]:5060
Call-ID: a35cce1f-6760-4f22-9be1-8b343f7a26f0
CSeq: 64516 NOTIFY
Subscription-State: terminated
Event: message-summary
Allow-Events: presence, dialog, message-summary, refer
Max-Forwards: 70
User-Agent: FPBX-15.0.16.75(16.11.1)
Content-Type: application/simple-message-summary
Content-Length: 48

Messages-Waiting: no
Voice-Message: 0/0 (0/0)

<— Transmitting SIP request (631 bytes) to UDP:10.11.37.59:5060 —>
NOTIFY sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.11.250.1:5060;rport;branch=z9hG4bKPja68f1dbe-d255-4157-b42b-4a0f095c7fb7
From: sip:[email protected];tag=5b7adfa0-3d1e-4a3d-9425-70398a97fc20
To: sip:[email protected]
Contact: sip:[email protected]:5060
Call-ID: a35cce1f-6760-4f22-9be1-8b343f7a26f0
CSeq: 64516 NOTIFY
Subscription-State: terminated
Event: message-summary
Allow-Events: presence, dialog, message-summary, refer
Max-Forwards: 70
User-Agent: FPBX-15.0.16.75(16.11.1)
Content-Type: application/simple-message-summary
Content-Length: 48

Messages-Waiting: no
Voice-Message: 0/0 (0/0)

<— Transmitting SIP request (631 bytes) to UDP:10.11.37.59:5060 —>
NOTIFY sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.11.250.1:5060;rport;branch=z9hG4bKPja68f1dbe-d255-4157-b42b-4a0f095c7fb7
From: sip:[email protected];tag=5b7adfa0-3d1e-4a3d-9425-70398a97fc20
To: sip:[email protected]
Contact: sip:[email protected]:5060
Call-ID: a35cce1f-6760-4f22-9be1-8b343f7a26f0
CSeq: 64516 NOTIFY
Subscription-State: terminated
Event: message-summary
Allow-Events: presence, dialog, message-summary, refer
Max-Forwards: 70
User-Agent: FPBX-15.0.16.75(16.11.1)
Content-Type: application/simple-message-summary
Content-Length: 48

Messages-Waiting: no
Voice-Message: 0/0 (0/0)

Then when I check the endpoint I see the following:
Endpoint: 1611/1611 Unavailable 0 of inf
InAuth: 1611-auth/1611
Aor: 1611 1
Contact: 1611/sip:[email protected]:5060 a8a142411c Unavail nan

I have also tried different voice codecs with no avail. On the extension, t38 is enabled - no idea of what else to check :frowning:

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