[asterisk-users] dahdi wcb4xxp and fax

[Olivier]

2009/2/27 Matthew Fredrickson <creslin at digium.com>

> I have a couple of suggestions:
> <snip>
>
> Olivier wrote:
> >
> >
> > 2009/2/25 stoffell <stoffell at gmail.com <mailto:stoffell at gmail.com>>
> >
> >     Hi all,
> >
> >     I wanted to switch from my current setup (mISDN) to the native dahdi
> >     with b410p support (wcb4xp). All works fine for normal phone calls
> >     but not for faxing. Faxes are distorted, if arriving at all, and
> >     hylafax logs the usual bad stuff (HDLC frame not byte-oriented.)
> >
> >
> > What about outgoing faxes ?
> >
> >
> >
> >     Our setup uses a digium b410p card with asterisk 1.6, latest libpri
> >     and dahdi, hylafax with iaxmodem, and all this on 1 machine.
> >
> >     chan_dahdi.conf contains:
> >     faxdetect=both
> >
> >     When receiving a fax call, hylafax (iaxmodem) answers the call after
> >     the obligatory wait of 3 seconds (fax detection) but to me it seems
> >     that echo cancellation is still being done.
> >
> >
> > Theory is that any echo canceller hearing a 2100Hz fax signal would halt
> > itself, so I wouldn't search in that direction first.
> >
> > Have you tried native 1.6 sendFax, receiveFax ?
> > Maybe it would improve fax performance.
> >
> >
> >
> >     Any pointers on this or workarounds? We're back to our old misdn
> >     setup for now ;)
> >
> >     Here's some output from "dahdi show channel 1" (the one that had the
> >     fax connection going), i cut out some non-related stuff :
> >     *CLI> dahdi show channel 4
> >     Signalling Type: ISDN BRI Point to Point
> >     Owner: DAHDI/4-1
> >     Real: DAHDI/4-1
> >     Callwait: <None>
> >     Threeway: <None>
> >     Confno: -1
> >     DSP: yes
> >     Busy Detection: no
> >     TDD: no
> >     Relax DTMF: no
> >     Dialing/CallwaitCAS: 0/0
> >     Default law: alaw
> >     Fax Handled: yes
> >     Pulse phone: no
> >     DND: no
> >     Echo Cancellation:
> >             128 taps
> >             (unless TDM bridged) currently ON
> >     PRI Flags: Call
> >     PRI Logical Span: Implicit
> >     Actual Confinfo: Num/0, Mode/0x0000
> >     Actual Confmute: No
> >
> >
> >
> >     Regards,
> >     stoffell
> >
> >


For curiosity, could improve Fax reception with wcb4xxp driver ?
Which asterisk version did you precisely pick ? You mentioned 1.6.
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