[asterisk-users] documentation of DAHDI dial options

[Olivier]

2009/7/7 Jared Smith <jsmith at digium.com>

> On Tue, 2009-07-07 at 15:42 +0200, Klaus Darilion wrote:
> > I am searching for the description of the available dialstrin options
> > for the DAHDI channel (and also other channel types).
> >
> > I am not looking for outdated voip-info links, but for the authoritative
> > source, e.g. something like "core show application Dial"
> >
> > Does such thing exists?
>
> I don't think that such a thing exists.  The only ones I'm aware of are:
>
> 1) Channel Groups.
>
> DAHDI/g1/5551212 dials 5551212 on the first available channel in group
> one, searching from lowest to highest
>
> DAHDI/G1/5551212 dials 5551212 on the first available channel in group
> one, searching from highest to lowest
>
> DAHDI/r1/5551212 dials 5551212 on the first available channel in group
> one, going in round-robin fashion (and remembering where it last left
> off), searching from lowest to highest
>
> DAHDI/R1/5551212 dials 5551212 on the first available channel in group
> one, searching in round-robin fashion from highest to lowest.
>
> 2) Distinctive ring
>
> DAHDI/4r1 dials channel 4 (presumably an FXS channel), and uses
> distinctive ring style one.  If I recall, there are four different
> distinctive ring styles... so you could replace r1 with r2, r3, or r4.
>
> 3) Answer confirmation
>
> DAHDI/1c/5551212 tells Asterisk to dial 5551212 on DAHDI channel 1, and
> not consider the call answered until the called party presses #.  This
> is useful because of the way analog signaling works.  Without this
> setting, Asterisk considers any outbound analog call on an FXO port
> answered just as soon as it has been dialed.
>
> 4) Digital calls
>
> DAHDI/1d/5551212 tells Asterisk to dial 5551212 on DAHDI channel 1, and
> that it's a digital call.  If I remember correctly, this is used for
> ISDN calls to set the bearer capability.
>
> I've taken a quick look in channels/chan_dahdi.c in TRUNK, and it seems
> to match up with my understanding, as I didn't see any other options
> stand out.  While poking around in there, I found the following comment:
>
>        /*
>         * data is ---v
>         * Dial(DAHDI/pseudo[/extension])
>         * Dial(DAHDI/<channel#>[c|r<cadance#>|d][/extension])
>         * Dial(DAHDI/(g|G|r|R)<group#(0-63)>[c|r<cadance#>|d][/extension])
>         *
>         * g - channel group allocation search forward
>         * G - channel group allocation search backward
>         * r - channel group allocation round robin search forward
>         * R - channel group allocation round robin search backward
>         *
>         * c - Wait for DTMF digit to confirm answer
>         * r<cadance#> - Set distintive ring cadance number
>         * d - Force bearer capability for ISDN/SS7 call to digital.
>         */
>
> That's probably as definitive an answer as you're going to get.


What is this was commented such as it could be added to a "core show
application Dial" ?

>
>
>
> --
> Jared Smith
> Training Manager
> Digium, Inc.
>
>
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