[asterisk-users] spa8000 t38 faxing

[isrlgb at gmail.com]

Ok thanks I found the problem


The spa8000 has some bugs with t38 which are fixed in the spa2102 but not in the 8000

1. If the adapter starts with g711 It doesn't switch to t38 

2. (This my problem) when it does go to t38 and the itsp asks for it to fallback to 9600 it doesn't fallback so they never end up speaking to each other

These were fixed in the 2102 according to the release notes 

Well now I hope I could get someone at cisco to look at it because I have more than a dozen 8000's 

Thanks for your help

-----Original Message-----
From: Larry Moore <lmoore at starwon.com.au>
Sender: asterisk-users-bounces at lists.digium.com
Date: Sun, 27 Mar 2011 11:26:35 
To: <asterisk-users at lists.digium.com>
Reply-To: Asterisk Users Mailing List - Non-Commercial Discussion
	<asterisk-users at lists.digium.com>
Subject: Re: [asterisk-users] spa8000 t38 faxing

Perhaps this will help.

I have a SPA8800 which has 4 x FXS & 4 x FXO ports.

It took me some time to produce a working configuration.

In Asterisk I have the following where 904 is the extension of the 
fax-modem and itsp is you VoIP Service Provider.

sip.conf

  [general]
  .
  .
  faxdetect=no
  t38pt_udptl=yes,redundancy,maxdatagram=400
  .
  .

  [904]
  ; Cisco SPA8800 FXS Port 4
  ; Analogue FAX Modem attached
  type=friend
  defaultuser=904
  secret=<secret>
  call-limit=2
  qualify=yes
  canreinvite=no
  directmedia=no
  directrtpsetup=no
  ignoresdpversion=yes
  transport=udp,tcp
  host=dynamic
  context=<your_context>
  faxdetect=no

  .
  .
  [itsp]
  .
  .
  faxdetect=yes
  ignoresdpversion=yes
  .
  .


I am including information from my SPA8800 for one of the FXS ports I 
have a Fax Modem attached to, the key to getting it to work I believe is 
the "FAX Tone Detect Mode".

Audio Configuration

  Preferred Codec: G711a          Second Preferred Codec: Unspecified
  Third Preferred Codec: Unspecified    Use Pref Codec Only: no
  Silence Supp Enable: yes          Silence Threshold: medium
  G729a Enable: no              Echo Canc Enable: yes
  G723 Enable: no              Echo Canc Adapt Enable: yes
  G726-16 Enable: no              Echo Supp Enable: yes
  G726-24 Enable: no              FAX CED Detect Enable: yes
  G726-32 Enable: no              FAX CNG Detect Enable: yes
  G726-40 Enable: no              FAX Passthru Codec: G711a
  DTMF Process INFO: yes          FAX Codec Symmetric: yes
  DTMF Process AVT: yes          FAX Passthru Method: ReINVITE
  DTMF Tx Method: AVT              DTMF Tx Mode: Strict
  DTMF Tx Strict Hold Off Time:  40    FAX Process NSE: no
  Hook Flash Tx Method: None          FAX Disable ECAN: no
  Release Unused Codec: yes         FAX Enable T38: yes
  FAX T38 Redundancy: 1          FAX Tone Detect Mode: callee only
  Symmetric RTP: yes

Supplementary Service Settings

  CW Setting: no                Block CID Setting: no
  Block ANC Setting: no            DND Setting: no
  CID Setting: yes              CWCID Setting: yes
  Dist Ring Setting: yes            Secure Call Setting: no
  Message Waiting: no            Accept Media Loopback Request: automatic
  Media Loopback Mode: source        Media Loopback Type: media

Larry.

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