[asterisk-users] Fax with T.38

[David Hindmarsh]

Hi Thomas,
 
In the Patton SN4960, try making the codec 1 alaw instead of g729.
 
Cheers
Dave

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From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Thomas Deillon
Sent: Thursday, 15 February 2007 8:56 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: RE: [asterisk-users] Fax with T.38



Hi all,

 

I make mistakes in my explanation, so I will try to re-explain my problem.

 

I want to send fax with FoIP.

Analog Fax <---->  PATTON SN4960 <----> Asterisk <----> PATTON M-ATA <---->
Analog Fax 2

 

In the Patton SN4960 configuration I have :

profile voip FOIP

  codec 1 g729 rx-length 20 tx-length 20 no-silence-suppression

  codec 2 g711alaw64k rx-length 30 tx-length 30 no-silence-suppression

  codec 3 g711ulaw64k rx-length 30 tx-length 30 no-silence-suppression

  dtmf-relay signaling

  dejitter-max-delay 100

  fax transmission 1 relay t38-udp

  fax redundancy low-speed 2 high-speed 1

  fax detection fax-frames

  modem transmission 1 bypass g711alaw64k

  modem bypass-method nse

 

On Patton M-ATA :

1.	codec alaw 

2.	codec ulaw 

3.	codec g729 

No silence suppression on these codecs. 

I not use this option "FAX without T.38(Use G.711 fax)"

 

 

On asterisk side I have:

[general]

context=default         

bindport=5060        

bindaddr=0.0.0.0               

srvlookup=yes         

disallow=all                   

allow=alaw                    

dtmfmode = rfc2833              

rtcachefriends=yes

realm=vtxvoip

useragent=VTX SIP

rtupdate=yes

language=en

tos=184

notifyringing=yes

t38pt_udptl=yes

 

And t38pt_udptl=yes in the 2 PATTONs sip accounts .

 

 

Then, I made a trace when I call from Analog FAX 2 to Analog fax 1 ..

I received T.38 packets from the Patton sn4960 but no T.38 packets go
through the Asterisk .. And on the asterisk I have 3 WARNINGS:

 

[Feb 15 10:05:24] WARNING[9167]: channel.c:3033 ast_channel_make_compatible:
No path to translate from SIP/sip_trunk_gva-01-0071e6b0(256) to
SIP/0xxx0379xx-0070a490(8)

[Feb 15 10:05:33] WARNING[9163]: channel.c:2702 set_format: Unable to find a
codec translation path from alaw to g729

[Feb 15 10:05:33] WARNING[9163]: channel.c:2702 set_format: Unable to find a
codec translation path from alaw to g729

 

 

What I really not understand it's why asterisk try to translate from ulaw to
g729 !!!

I disallow all and allow just the alaw codec . more than this, I remove the
g729 licence file . 

 

Do you have an idea for me ??

 

Thanks a lot,

 

Thomas 

 


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