[Freeswitch-users] Can't get fax working

[Boris Kovalenko]

Hello!


     I collected tcpdump between Freeswitch and Audiocodes MP-114 and 
found something strange. The sequence of packets is:
FS  INVITE with SDP
MP 100 Trying
MP 180 Ringing
MP 200 OK with SDP
FS/MP RTP/RTP
MP ReINVITE with SDP
FS 100 Trying
---- long pause and call disconnected
MP BYE
FS 200 OK with SDP !!!!! CSeq: INVITE !!!!!
FS 200 OK CSeq BYE
FS 200 OK with SDP !!!!! CSeq: INVITE !!!!!
FS 200 OK with SDP !!!!! CSeq: INVITE !!!!!
FS 200 OK with SDP !!!!! CSeq: INVITE !!!!!

Thinking this is a problem of T.38 operation. Sometimes, IMHO, 
Freeswitch is buffering??? 200 OK response and session can not be 
established. Where may I place dump for gurus may look at it?

> Hello!
>
>     I need help with fax configuration. My network is:
>
> PSTN E1 --- Cisco AS5350 -- Freeswitch -- Audiocodes MP-114 -- Fax
>
> FS version: FreeSWITCH Version 1.0.head (git-062f07f 2011-07-16 
> 12-35-25 +0200)
> Audiocodes firmware: 6.00A.038.004
> I can't get faxes working :( In FS profiles there is a parameter 
> <param name="t38-passthru" value="true"/>
> Cisco DP fax settings:
> fax-relay ecm disable
>  fax rate 9600
>  fax protocol t38 ls-redundancy 2 hs-redundancy 1 fallback 
> pass-through g711alaw
>  no vad
>
> On Audiocodes there is also T38 enabled (as I think) but there is no 
> T38. There are messages on MP-114:
> ErrMgs=16 T38Decoder received Non-T38 Packet
> and
> ||
> Modem Relay Is Not Supported! Forcing Bypass Mode
>
>
> Please, help! What information I need to collect to help solve the problem?
> -- 
> Regards,
> Boris
>
>
>
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-- 
Regards,
Boris


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