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How to integrate PBXnSIP with NET SatisFAXtion


Art King
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Is PBXnSIP also supported, or has anyone got it working, with the free VOIP plugin for Windows Fax that FaxBack offer (which appears to have an *identical* architecture from the SIP end)? We have got it working fine for inbound faxes, but nomatter what configuration we try, it is unable to send faxes outbound.

 

PBXnSIP seems to get confused by the sip: prefix that FaxBack uses in the SIP messages, but we got around that with a special dial plan for the fax extension.

 

All the fax calls now start dialling, but fail immediately "bad address" in the fax software and the following 400 bad request error:

 

SIP/2.0 400 Bad Request

Via: SIP/2.0/UDP 192.168.0.2:5060;branch=z9hG4bK1005

From: IPFax <sip:108@192.168.0.2>;tag=IPF_PORT_0001_1003

To: <sip:88888888>;tag=01d725d3ce

Call-ID: d32d6fff-77bf-41db-bdc7-4143ba5e8638@192.168.0.2

CSeq: 2 INVITE

Contact: <sip:108@192.168.0.10:5060>

Supported: 100rel, replaces, norefersub

Allow-Events: refer

Allow: INVITE, ACK, CANCEL, BYE, REFER, PRACK, INFO, UPDATE

Accept: application/sdp

User-Agent: pbxnsip-PBX/3.4.0.3201

Content-Length: 0

 

(please note the 88888888 above is the correct destination fax number)

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Can you post the actual request that PBX receives?

 

 

Is PBXnSIP also supported, or has anyone got it working, with the free VOIP plugin for Windows Fax that FaxBack offer (which appears to have an *identical* architecture from the SIP end)? We have got it working fine for inbound faxes, but nomatter what configuration we try, it is unable to send faxes outbound.

 

PBXnSIP seems to get confused by the sip: prefix that FaxBack uses in the SIP messages, but we got around that with a special dial plan for the fax extension.

 

All the fax calls now start dialling, but fail immediately "bad address" in the fax software and the following 400 bad request error:

 

SIP/2.0 400 Bad Request

Via: SIP/2.0/UDP 192.168.0.2:5060;branch=z9hG4bK1005

From: IPFax <sip:108@192.168.0.2>;tag=IPF_PORT_0001_1003

To: <sip:88888888>;tag=01d725d3ce

Call-ID: d32d6fff-77bf-41db-bdc7-4143ba5e8638@192.168.0.2

CSeq: 2 INVITE

Contact: <sip:108@192.168.0.10:5060>

Supported: 100rel, replaces, norefersub

Allow-Events: refer

Allow: INVITE, ACK, CANCEL, BYE, REFER, PRACK, INFO, UPDATE

Accept: application/sdp

User-Agent: pbxnsip-PBX/3.4.0.3201

Content-Length: 0

 

(please note the 88888888 above is the correct destination fax number)

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Can you post the actual request that PBX receives?

 

We've got it dialling out now with an amazing amount of hassle with the special Fax dial plan, but the fax calls always drop after about 40 seconds with "send error, no answer".

 

I suspect a codec problem as the speed is reported as 300bps (although I'm not sure this is 100% accurate either).

 

Firstly, does the CS410 support T.38 passthrough? What needs to be configured to enable it in terms of codecs (the system is set up currently to only use G.711a and G.711u in that order)?

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We are trying to send faxes over SIP lines (not via the FXO gateway) and I have used this with the same provider on a different device so I know it should work - not via the FXO lines so that shouldn't be the issue.

 

Can you drop me an email so I can send you the full log please? I'm not sure really what bit you're after and the log is huge when it's set up to show anything meaningful for fax calls.

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