[Asterisk-Users] x100p and groundstart signaling - help

[Chris Shaw]

GroundStart's lack of reliable disconnect functionality is bad news for a
PBX... It allows potential toll fraud abuse... Has anyone actually done any
statistics for glare? I'd imagine the chances of that actually happening on
modern hardware is slim to none...


----- Original Message -----
From: <ghost at silcon.com>
To: <asterisk-users at lists.digium.com>
Sent: Friday, July 09, 2004 2:37 PM
Subject: Re: [Asterisk-Users] x100p and groundstart signaling - help


> Hi,
>
> Groundstart signalling is not supported on Digium (or clone) X100P and
> TDM400P FXO cards.  I recently found this out from Digium support.  I
> posted a message about this a few days ago.  Be aware that you will lose
> the anti-glare benefit of groundstart if you switch your lines to
> loopstart.  (Glare is when an incoming call and an outgoing call are
> started at the same time - The person calling you heres you dialing digits
> to make an outbound call and then you don't hear any ringing, say hello
> and are confused for a second about what just happened.) Here it is again
> -
>
> ...
>
> I was surprised to be told by a Digium support person today that Digium's
> FXO interfaces (X100P, TDM400P FXO modules) don't support groundstart
> signalling.  This surprises me because as far as I know in a typical PBX
> configuration with analog trunk lines, groundstart signalling is the only
> way to prevent Glare.
>
> I just purchased two TDM400P's for a system I'm building to replace our
> office PBX (Altigen).   Since there are no statements anywhere on Digium's
> website about lack of groundstart support (Actually, to the contrary they
> boast about all the signalling support in their sales slick), I now need
> to decide if I want to return the products and switch to a T1 / channel
> bank configuration.
>
> I remember when we setup our current Altigen PBX, we had problems with
> glare and disconnect detection and so I went through the process of
> figuring out what was going on and learning about groundstart.  After we
> switched to groundstart everything worked great.
>
> In a high use system, it's highly likely that a trunk will experience
> glare, which is annoying for incoming callers and system users.   I'm just
> a bit baffled as to why Digium wouldn't support groundstart on cards
> designed to be PBX trunk lines.
>
> Someone please tell me I'm missing something.
>
> Mark
>
>
>
>
> > yes, fxsks and fxsls are working fine. only fxsgs is giving me the
error.
> > and that is how my lines are configured by the phone company. I'll
> > probably call them and try to change the lines ...
> >
> >
> >
> >>
> >>   I'm not at my box right now, but if I remember
> >> correctly, I got this exact same error when I tried
> >> playing around with groundstart.  At the time, I
> >> figured I was doing something wrong, or that my line
> >> did not support gs, and the card somehow knew that.
> >>
> >>   I was able to configure for the other two types of
> >> signalling just fine.
> >>
> >> --shaun
> >>
> >> --- gabriel <lists at bayintegrated.net> wrote:
> >>> hello,
> >>> I just installed 2 brand new x100p cards into my
> >>> linux system. Everything
> >>> compliled and worked fine from the first try.
> >>> Hoewver the phone lines I
> >>> will use with this system have groundstart
> >>> signaling. I have tried to
> >>> change the zaptel.conf and zapata.conf to use this
> >>> type of signaling but
> >>> ztcfg gives me an error every time with the new
> >>> configuration.
> >>> Bellow are the config files and the actual error.
> >>> Again, everything works
> >>> fine with the default signaling (fxsks)
> >>>
> >>> zaptel.conf
> >>> ---
> >>> loadzone = us
> >>> defaultzone = us
> >>>
> >>> fxsgs=1-2
> >>>
> >>>
> >>>
> >>> zapata.conf
> >>> ---
> >>> [channels]
> >>> callwaiting=yes
> >>> callwaitingcallerid=yes
> >>> threewaycalling=yes
> >>> transfer=yes
> >>> cancallforward=yes
> >>>
> >>> echocancel=yes
> >>> echocancelwhenbridged=no
> >>>
> >>> rxgain=0.0
> >>> txgain=0.0
> >>>
> >>> immediate=no
> >>>
> >>> context=default
> >>> signalling=fxs_gs
> >>> channel=1-2
> >>>
> >>>
> >>> and the error I am getting is:
> >>> --
> >>> [root at voip root]# ztcfg -vvv
> >>>
> >>> Zaptel Configuration
> >>> ======================
> >>>
> >>>
> >>> Channel map:
> >>>
> >>> Channel 01: FXS Groundstart (Default) (Slaves: 01)
> >>> Channel 02: FXS Groundstart (Default) (Slaves: 02)
> >>>
> >>> 2 channels configured.
> >>>
> >>> ZT_CHANCONFIG failed on channel 1: Invalid argument
> >>> (22)
> >>> Did you forget that FXS interfaces are configured
> >>> with FXO signalling
> >>> and that FXO interfaces use FXS signalling?
> >>> [root at voip root]#
> >>> ---
> >>>
> >>> I don't know why I am getting this the only choice I
> >>> have is to have the
> >>> phone company change the signaling but before doing
> >>> that I was thinking
> >>> that maybe somebody used this signaling before and
> >>> can help.
> >>>
> >>> thank you,
> >>> gabriel
> >>>
> >>>
> >>> _______________________________________________
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> >>>
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> >>
> >>
> >>
> >>
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