[Asterisk-Users] x100p and groundstart signaling - help

[ghost at silcon.com]

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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