[asterisk-users] [UK SPECIFIC] DAHDI and a OpenVox Card

[Gordon Henderson]

On Fri, 1 May 2009, Tzafrir Cohen wrote:

> Is this a place where you get a polarity reversal event on call startup?

In the UK we do. (Well on BT lines - I've a funny feeling some 
Telewest/NTL lines use Bell signaling).

On an incoming call we get:

   Polarity reversal.
   FSK Caller ID burst
   Ringing

I've not upgraded any analogue systems to dahdi yet, but from what I've 
read so-far, there's not much difference between the config files (other 
than their names and locations), but a typical /etc/zaptel.conf file looks 
like:

   fxoks=1
   fxsks=4
   loadzone=uk
   defaultzone=uk

This has one FXO and one FXS port.

The corresponding zapata.conf is:

   [trunkgroups]
   [channels]
   usecallerid=yes
   cidsignalling=v23
   cidstart=polarity
   hidecallerid=no
   callwaiting=no
   threewaycalling=yes
   transfer=yes
   echocancel=yes
   ;echotraining=yes	; off for oslec
   ;echocancelwhenbridged=yes
   immediate=no
   faxdetect=no

   ; Channel 1: Local analogue line
   context=internal
   group=0
   signalling=fxo_ks
   sendcalleridafter=2
   rxgain=0
   txgain=0
   mailbox=202
   callerid=The Red Phone <202>
   channel => 1

   ; Channel 4: PSTN line
   context=incoming-zap-ddi
   group=1
   usecallerid=yes
   faxdetect=none
   signalling=fxs_ks
   rxgain=8
   txgain=8
   callerid=asreceived
   channel => 4

Hope this is may be some use.

Gordon