[SIPForum-discussion] FAX Issue in VoIP

[Garrity, John N. (Infrastructure Solutions Dept.)]

You may find that the FAX machine is set for high quality printing which
may not be compatible with T38.

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From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Brent Shaw
Sent: Thursday, September 09, 2010 2:14 PM
To: murali shankar; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] FAX Issue in VoIP



The errors that you list make it look like you are not even getting a
successful connection/negotiation. Do you actually connect, and then the
failure occurs during transmission? If so, you might want to check the
following settings:

 

t38 max-bps rate <value>

t38 max-buffer size (Had to adjust from default 200, to 262)
t38 max-datagram (Had to adjust from default 72, to 176)

 

Check the SDP offer when the T.38 session is initiated. 


Your default values may be different 

 

Brent 

 

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of murali shankar
Sent: Wednesday, September 08, 2010 8:28 PM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] FAX Issue in VoIP

 

Dear All,

 

            Whenever am trying to send multiple pages in FAX over VoIP
at a single attempt the FAX is getting failed .Whereas for the same
number the FAX is going fine for single Paper.Can any one help me out?

 

Voip Gateway: Free Switch PBX.

Protocol: T.38

Codec: G.729A & G.711U

Baud rate: 9000 to 14400

 

Errors:

1. Busy Signal Detected.

2.No response to pps repeated 3 times.

3.Failed to train remote modem at 2400 BPS or minimum speed.

 

 

Please suggest.

 

Regards,

Murali

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