On Wed, Oct 30, 2013 at 8:40 AM, Greg Woods <[email protected]> wrote:
> I've got a Digium Wildcard TDM410P with one POTS line and three > extensions. One of the extensions is connected to a fax modem. This kind > of works, but there's a gotcha. If I set faxdetect=incoming in > chan_dahdi.conf, then incoming faxes do get routed to the modem and this > all works, but outbound faxes fail, with a message like this: > > [Oct 29 21:57:09] WARNING[16732][C-00000000] app_dial.c: Unable to > create channel of type 'DAHDI' (cause 17 - User busy) > > If I set faxdetect=no, then outbound faxes work, but of course incoming > faxes do not get routed to the modem. I'm guessing that what is > happening is that the "outbound" call coming in from the modem's channel > is an "incoming" call on that channel, asterisk detects the fax and > tries to route it to the same channel, resulting in busy. > > Is there any way around this catch-22? Is there some way to set > faxdetect=incoming only on the one POTS line channel? > > The only alternative I can think of would be a kludgy Radio Shack-style > solution like a manual switcher, that switches the modem between the > connection to the dahdi channel (receive) and a direct connection to the > POTS line (send). I'd really like not to have to resort to that. One thing you must remember about the [channels] section in chan_dahdi.conf is that *all* configuration in the section is cumulative. For example: [channels] echocancel = yes faxdetect=incoming signaling=fxs_ks channel=1 ; Channel 1 is created at this point with echocancel enabled, faxdetect is incoming, ; and fxs_ks signaling. faxdetect=no channel=2 ; Channel 2 is created at this point with echocancel enabled, faxdetect is no, ; and fxs_ks signaling. The echocancel and signaling settings were set before ; channel 1 was created and those settings are still in effect when channel 2 ; is created. Richard
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