>
>First of all could you please explain loop-start and ground-start for me? What
>are they used for?
>>
>Loop start is the simplest type of analog phone signalling. It's used to
>connect an FXS (like a central office) with a very simple FXO device (like a
>handset). In this signalling mode, the FXS device basically sends a DC current
>down the line to the FXO. When the FXO device (handset) goes offhook, it
>shorts both wires (tip and ring). The FXS device will then detect this
>"offhook" state from the DC current that returns on "the loop".
>
>
>Kewl start is Asterisk's name for Loop Start with the "disconnect supervision"
>feature. This is most likely what you want to select over regular loop start.
>http://en.wikipedia.org/wiki/Disconnect_supervision
>
>
>Ground start is typically used to connect an FXS (like a central office) to
>something more complicated like a PBX. In this signalling mode, both devices
>are able to provide a DC current on the line. This affords some extra line
>supervision options that are handy to have with a PBX. From what I understand,
>this is a pretty rare mode these days ...
>
>
>
>>Next, I have the following configurations:
>>
>>
>>
>>dahdi-channels.conf :
>>
>>context=pstn-channels
>>signalling=fxs_ks
>>channel=>130
>>context=phone-channels
>>signalling=fxo_ks
>>channel=>127
>>
>>chan_dahdi.conf :
>>
>>[channels]
>>cidsignalling=dtmf
>>cidstart=dtmf
>>
>>signalling=fxo_ls
>>pulsedial=no
>>usecallerid=yes
>>context=pstn-channels
>>channel=>130
>>
>Signalling is determined by the device you want to signal TO. So if channel
>130 is connected to the pstn, you likely want fxs signalling. This would mesh
>with how you have dahdi-channels.conf and /etc/dahdi/system.conf.
>
>
>
>>signalling=fxs_ls
>>context=phone-channels
>>channel=>127
>>
>Same here as above. If channel 127 is connected to phones (fxo) you probably
>want fxo signalling here.
>Also, dahdi-channels.conf is generated by dahdi's best guess and is typically
>intended to be #included at the bottom of chan_dahdi.conf. Not sure if you
>left that out on purpose.
>
>
>>extensions.conf :
>>
>>[pstn-channels]
>>exten=>_.,1,Dial(DAHDI/127/${EXTEN})
>>
>>[phone-channels]
>>exten=>_.,1,Dial(DAHDI/130/${EXTEN})
>>
>>/dahdi/system.conf
>>fxoks=125-128
>>fxsks=129-132
>>
>>I can hear the dial tone from the phone with these configurations. As soon as
>>I comment "signalling" type in chan_dahdi.conf, dial tone comes up. What's
>>the problem with these configurations?
>>
>>
>>--
>>_____________________________________________________________________
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>>
>
>
>
>--
>
>Russ Meyerriecks
>Digium, Inc. | Linux Kernel Developer
>445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
>direct: +1 256-428-6025
>Check us out at: www.digium.com & www.asterisk.org
Thanks for your help. It's very useful. I have change my chan_dahdi.conf file
as you said:
>
>[channels]
>
>cidsignalling=dtmf
>cidstart=dtmf
>
>signalling=fxs_ls
>pulsedial=no
>usecallerid=yes
>context=pstn-channels
>channel=>130
>signalling=fxo_ls
>context=phone-channels
>channel=>127
>
>
>But still the dial tone can not be heard and as soon as I comment these two
>lines, dial tone comes up. What's the problem?
>Thanks in advance
>
>--
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