confused with fxo/fxs :-(

byaru1

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#1
Folk,

Someone please explain to me - We have an existing (pots) PBX, which I am interfacing with asterik (elastix) using a digium TDM400P with 2fxs/2fxo configuration. We want the users in the IP cloud to reach the other PBX and vice-varsa using this single extension from the pots pbx.

Should I plug the telephone cable of this extension into an fxs or fxo port? Because, logically, I treat it as an "incoming telephone line" to the asterisk?

How about a direct analog line from an ADSL splitter? Do I also hook such a cable into the fxo or fxs port? Because ordinarily, this cable would hook into a telephone headset, so can I hook it into fxs? I'm certainly confused..
 

DaveD

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#2
You would need to plug into FXO
FXS is for adding analog handsets as extensions
 

byaru1

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#3
You would need to plug into FXO
FXS is for adding analog handsets as extensions
Yes, this is what I suspected, but currently, the phone line (from the ADSL splitter) is in fact plugged into fxs port (no 4) and the asterisk can receive calls from this (on DAHDI 4/1) and redirect them to an IP phone. So, I am really confused why this is so? Here is my dahdi-channels.conf,

; Autogenerated by /usr/sbin/dahdi_genconf on Tue Jun 30 11:41:40 2009 -- do not hand edit
; Dahdi Channels Configurations (chan_dahdi.conf)
;
; This is not intended to be a complete chan_dahdi.conf. Rather, it is intended
; to be #include-d by /etc/chan_dahdi.conf that will include the global settings
;

; Span 1: WCTDM/4 "Wildcard TDM400P REV I Board 5" (MASTER)
;;; line="1 WCTDM/4/0 FXOKS"
signalling=fxo_ks
callerid="Channel 1" <4001>
mailbox=4001
group=5
context=from-internal
channel => 1
callerid=
mailbox=
group=
context=default

;;; line="2 WCTDM/4/1 FXOKS"
signalling=fxo_ks
callerid="Channel 2" <4002>
mailbox=4002
group=5
context=from-internal
channel => 2
callerid=
mailbox=
group=
context=default

;;; line="3 WCTDM/4/2 FXSKS"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-pstn
channel => 3
callerid=
group=
context=default

;;; line="4 WCTDM/4/3 FXSKS"
signalling=fxs_ks
callerid=asreceived
group=0
context=from-pstn
channel => 4
callerid=
group=
context=default


So, it appears to me that channel 4 is indeed fxs, but why is it that the system received and send a call through this channel? (DAHDI/4-1)? Does the nomenclature DAHDI/4-1 mean channel 4? What does the 1 mean?
 

DaveD

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#4
Channel 4 is FXO
FXS channels will have from-internal
 

byaru1

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#5
Ah yes, I see my confusion - thanks.

My other problem is that when calling in from outside to any of the incoming lines, the system does not hang up when the call is terminated. I have to manually hang up the calls in the flash panel.

This is not the case with outgoing calls though.

What can I do to rectify this?

thanks
eb
 

DaveD

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#6
/etc/asterisk/chan_dahdi.conf
uncomment lines
;Uncomment these lines if you have problems with the disconection of your analog lines
busydetect=yes
busycount=3
 

byaru1

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#7
DaveD said:
/etc/asterisk/chan_dahdi.conf
uncomment lines
;Uncomment these lines if you have problems with the disconection of your analog lines
busydetect=yes
busycount=3
Thanks, I do much appreciate your assistance to a poor newbie !

Now, seems I'm getting there, but a few nuances still exist.

I'm setting up DISA, and our old PBX is a nortel with all nortel phones hooked into it. The problem is that when I make a call from any of the phones on the nortel PBX to DISA on my asterisk PBX, I get a dial tone from asterisk, but the asterisk does not seem to receive any tones when numbers are dialled from the phones. (Are these the DTMF tones/commands?) SO in short, the nortel system does not seem to pass DTMF tones to asterisk.

Is this someone else has experienced? How can I resolve this one?
 

byaru1

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#8
DaveD said:
/etc/asterisk/chan_dahdi.conf
uncomment lines
;Uncomment these lines if you have problems with the disconection of your analog lines
busydetect=yes
busycount=3
What do the above directives actually mean? Because sometimes, I'm still experiencing the issue of calls not hanging up even after uncomenting the lines above.

rgds
eb
 

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