[asterisk-users] $100 Bounty: Level3/Asterisk/Adtran T.38 Pass-through

[Eric Wieling]

udptl.conf settings:

[general]
udptlstart=4000
udptlend=4998
udptlchecksums=no
udptlfecentries = 3
udptlfecspan = 3
use_even_ports = yes
T38FaxUdpEC = t38UDPRedundancy
T38FaxMaxDatagram = 400


sip.conf settings:

directmedia=yes
faxdetect = no
t38pt_udptl=yes,redundancy,maxdatagram=400




-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Larry Moore
Sent: Thursday, December 27, 2012 4:00 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] $100 Bounty: Level3/Asterisk/Adtran T.38 Pass-through

On 28/12/2012 1:55 AM, Eric Wieling wrote:
> We are offering $100 (paid via paypal or check) to the first person who assists us in successfully sending and receiving faxes in the setup described below.  Offer expires Dec 31.  We are a direct customer of Level 3, there is no other carrier involved.

>
> What we want to work:
>
>      Level 3 T.38 TN <-> MSX/Nextone SBC <-> Asterisk 1.8.18.1 <-> Adtran NetVanta w/POTS and T.38 support.
>
> When we replace Asterisk with Kamailio faxes work fine.  When we put Asterisk there instead, then faxes fail nearly 100% of the time.
>
> I see the switch to T.38 in the Adtran debug logs.   We can originate and terminate T.38 calls in Asterisk using SendFax/ReceiveFax using T.38 so I'm assuming I have my udptl.conf and sip.conf settings correct.
>
>
>

In udptl.conf try the following option

;
; Some VoIP providers will only accept an offer with an even-numbered ; UDPTL port. Set this option so that Asterisk will only attempt to use ; even-numbered ports when negotiating T.38. Default is no.
use_even_ports = yes
;


Looking at some old notes other options I set for some devices to be able to pass through T.38 in sip.conf were,

directmedia=no
t38pt_udptl=no

May be worth checking the following;

directrtpsetup=no

Larry.

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