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: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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: > >>> -- > >>> [EMAIL PROTECTED] 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? > >>> [EMAIL PROTECTED] 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 > >>> > >>> > >>> _______________________________________________ > >>> Asterisk-Users mailing list > >>> [EMAIL PROTECTED] > >>> > >> http://lists.digium.com/mailman/listinfo/asterisk-users > >>> To UNSUBSCRIBE or update options visit: > >>> > >>> > >> http://lists.digium.com/mailman/listinfo/asterisk-users > >>> > >> > >> > >> > >> > >> __________________________________ > >> Do you Yahoo!? > >> Yahoo! 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