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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