[Asterisk-Users] x100p and groundstart signaling - help

Chris Shaw chriss at watertech.com
Fri Jul 9 15:50:18 MST 2004 

Nevermind... Stupid Me... I was thinking of LoopStart Lines... Really
KewlStart is the best anyway...


----- Original Message -----
From: "Chris Shaw" <chriss at watertech.com>
To: <asterisk-users at lists.digium.com>
Sent: Friday, July 09, 2004 3:19 PM
Subject: Re: [Asterisk-Users] x100p and groundstart signaling - help


> 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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