Thanks - and did you find a provider with T.38 DIDs? I don't see many pay as you go providers with T.38
From: [email protected] [mailto:[email protected]] On Behalf Of Larry Moore Sent: Monday, August 01, 2011 4:08 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] T38 Fax On 2/08/2011 1:02 AM, Robert Huddleston wrote: Anyone have any testing experience with T38 and HT-502 Grandstream? I just want to confirm that t.38 is working on this device. Thanks Yes, it works. I currently have latest firmware installed and it still works in T.38. I am using UDP transport for this device as I seem to encounter problems with TCP or TLS. I am currently running Asterisk 1.8.5.0. Product Model: HT-502 V1.1C Software Version: Program-- 1.0.5.5 Bootloader-- 1.0.0.9 Core-- 1.0.5.2 Base-- 1.0.5.2 Some settings I have set and you may wish to check for the FXS port are; Force INVITE: (X) No ( ) Yes (Always refresh with INVITE instead of UPDATE) Send Re-INVITE After Fax: ( ) No (X) Yes VAD: ( ) No (X) Yes Symmetric RTP: (X) No ( ) Yes Fax mode: (X) T.38 (Auto Detect) ( ) Pass-Through Fax tone detection mode: ( ) Caller (X) Callee ( ) Caller or Callee Jitter buffer type: (X) Fixed ( ) Adaptive Jitter buffer length: (X) Low ( ) Medium ( ) High You will need to ensure you are using redundancy mode instead of FEC. I am able to send a fax via my voice provider seemingly without errors even though ECM is not enabled, this is because redundancy mode is working as expected on the outbound communication. Unfortunately my voice provider only sends one data item in the incoming UDPTL hence the occasional missed line. Here is an extract from my sip.conf [general] . . t38pt_udptl=yes,redundancy,maxdatagram=400 . . [906] ; Grandstream HT502 FXS Port ; Analogue FAX Modem attached type=friend defaultuser=906 md5secret=c5bca943c9b0cc303c496fbf9d48a48e call-limit=1 disallow=g722 transport=udp qualify=yes directmedia=no host=dynamic context=FAX-T38 faxdetect=no deny=0.0.0.0/0.0.0.0 permit=10.0.0.0/255.0.0.0 permit=172.16.0.0/255.240.0.0 permit=192.168.0.0/255.255.0.0 Larry.
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