asterisk users - Sep 2003 - Fax tone detection problem on bridged (PRI -> SIP) calls

Greetings,

[w_pstn]
exten => 8478106205,1,record,w_faxmsg:pcm
exten => 8478106206,1,Dial,SIP/w_sip
exten => fax,1,Goto(w_fax,8478106207,1)

[w_fax]
exten => 8478106207,1,Dial,Zap/g1/8478106207

We send faxes (from the same fax machine) to 8478106205 and 8478106206.

On 8478106205 fax tone is always detected and we have a successful fax
transmission to 8478106207.
On 8478106206 call is connected to the SIP application, but the fax tone is
not detected, so we keep beeping (CNG) to the app.

In both cases we see several sequences of 4 messages each (uncommented in
dsp.c) like
	Fax energy/Second Harmonic: 57393933745.000381/22932862397.987717
so fax_hits counter should be the same.

Please, help.

Alex Zarubin
Webley Systems, Inc.


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Alex Zarubin wrote:
> Greetings,
>
> [w_pstn]
> exten => 8478106205,1,record,w_faxmsg:pcm
> exten => 8478106206,1,Dial,SIP/w_sip
> exten => fax,1,Goto(w_fax,8478106207,1)
>
> [w_fax]
> exten => 8478106207,1,Dial,Zap/g1/8478106207
>
> We send faxes (from the same fax machine) to 8478106205 and 8478106206.
>
> On 8478106205 fax tone is always detected and we have a successful fax 
> transmission to 8478106207.
> On 8478106206 call is connected to the SIP application, but the fax 
> tone is not detected, so we keep beeping (CNG) to the app.
>
> In both cases we see several sequences of 4 messages each (uncommented 
> in dsp.c) like
>         Fax energy/Second Harmonic: 57393933745.000381/22932862397.987717
> so fax_hits counter should be the same.
>
> Please, help.
>
> Alex Zarubin
> Webley Systems, Inc.
>
>
You need to give * about 3-5 seconds to recognize the CNG, so answer the 
call and then wait or background a message (silence ?) to give * time to 
recognize the CNG.

This how I received every call and is working...

Good luck.

exten => s,1,SetMusicOnHold(random)
exten => s,2,SetVar(Tries=1)
exten => s,3,Wait(1)
exten => s,4,Answer()
exten => s,5,DigitTimeout(5)
exten => s,6,ResponseTimeOut(10)
exten => s,7,BackGround(Welcome)

exten => fax,1,Dial(SIP/209||d)   <<-- Fax Device
exten => fax,2,Hangup()