[DIGIUM FAX] T38 Faxes

[cyrilparis]

Hi

I suceeded to send faxes in g711 but i have many problems with reliability (i have only around 25% faxes OK, many faxes have DROP error)

I m currently with asterisk 1.8.4-rc2, digium fax modules, and sip provider.

I would like to test in t.38 but i can't send faxes even if i activate t38.

Could you help ? I m not sure to understand how t.38 works (do i need specific provider?, can i send in SIP?)

It would be so much appreciated if someone provide example of sip.conf,extensions.conf and any usefull information to activate t38 ( i followed doc from digium but i guess i made mistakes somewhere)

thanks!


---------------
Here is my t.38 sip.conf
---------------

[general]

t38pt_udptl=yes
t38pt_rtp=no
t38pt_tcp=no

[FAX-OUT]
type = peer
qualify=yes
t38pt_udptl=yes
t38pt_rtp=no
t38pt_tcp=no
canreinvite=yes
host = sip.sipprovider.com
defaultuser = myuser
secret = mypass
insecure = port,invite
fromuser = sip_user
authuser = sip_pass
allow=alaw

[cyrilparis]

Hi

Can someone help?
Payment by Paypal is possible if someone can help to make work all fax sendings.

[zaib_kiani]

hi there,
i am getting below error
[May 11 15:54:29] WARNING[3363]: res_fax.c:1474 receivefax_t38_init: channel 'SIP/audiocodes.com-00000000' timed-out during the T.38 negotiation.

i am wondered what could be the issue, as the same provider is working fine on another asterisk server, both servers have similar asterisk version which is Asterisk 1.8.3.2. the server which is connected to the NETGEAR ROUTER is having issue. any one have any clue?

[cyrilparis]

Hi

do you have the same hardware servers? same distribution?

For my part i m still having the issue....

only around 50% of faxes are correctly sent

[zaib_kiani]

No both have different machines. the one where fax is not working have CentOS release 5.6 (Final) and the one where fax is working have CentOS release 5.4 (Final). i think it does make any difference, untill or unless your hardware has somthing to do with the SIP. as my calls are coming on SIP. please help me out, Moreover both of modules (res_fax_spandsp.so, res_fax.so) are loaded successfully.

[alexjack]

Well this is anot a minor issue if you are having all the 75 % of faxes losted then it means a lot .You need to consult a techanical guy for that.

[zaib_kiani]

I got it, if your SIP provider supports T.38 then it will be great as the success rate is 99% on T.38. However i am still using ulaw for fax and the success rate is almost 60-70%.

[cyrilparis]

Hi

Thanks if there any cheap sip voipprovider supporting t38 calls?

(i m currently using voipraider)