[asterisk-users] Correct settings for UK (BT) FXO

Thu Sep 14 11:10:25 MST 2006

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Brian Candler wrote:
> Is there a document somewhere giving the correct TDM400P FXO settings for
> use on a BT PSTN line in the UK? All I can find is
> http://www.voip-info.org/wiki/view/UK+Asterisk+Details
> 
> but it doesn't give the complete settings, such as loopstart vs kewlstart.
> 
> Anyway, the problem I'm having is that an incoming call is answered OK, but
> when the remote end disconnects this is not always noticed - at least, the
> Echo() application continues for some minutes before hanging up.
> 
> There's also an error message reported when loading wctdm, which may or may
> not be related; see below.
> 
> Here's my configuration:
> 
> --- zaptel.conf ---
> # Ports 1 and 2 are FXS (FXO signalling)
> fxoks=1-2
> # Port 4 is FXO (FXS signalling)
> fxsks=4
> 
> loadzone=uk
> defaultzone=uk
> 
> --- zapata.conf ---
> [trunkgroups]
> ; define any trunk groups
> 
> [channels]
> ;default
> usecallerid=yes
> hidecallerid=no
> callwaiting=no
> threewaycalling=yes
> transfer=yes
> echocancel=yes
> echotraining=yes
> immediate=no
> answeronpolarityswitch=no
> 
> ; define channels
> context=internal
> signalling=fxo_ks
> channel => 1
> 
> context=internal
> signalling=fxo_ks
> channel => 2
> 
> context=incoming
> signalling=fxs_ks       ; Use FXS signalling for an FXO channel
> channel => 4
> 
> --- extensions.conf ---
> [incoming]
> ; incoming calls from the FXO port are directed to this context from zapata.conf
> exten => s,1,Answer()
> exten => s,2,Echo()
> 
> --- other ---
> # grep wctdm /etc/modprobe.conf
> install wctdm /sbin/modprobe --ignore-install wctdm  && /sbin/ztcfg
> install wctdm24xxp /sbin/modprobe --ignore-install wctdm24xxp  && /sbin/ztcfg
> alias wcfxs wctdm
> options wctdm opermode=UK
> 
> -------------------
> 
> The base platform is CentOS 4.4, and I'm running Asterisk compiled from SVN
> trunk as of yesterday.
> 
> Starting from a freshly booted system, here's what I do: note there's an
> apparent problem when installing the wctdm module, but this doesn't seem to
> prevent it from accepting calls.
> 
> [root at asterisk1 ~]# modprobe zaptel
> [root at asterisk1 ~]# modprobe wctdm
> Notice: Configuration file is /etc/zaptel.conf
> line 0: Unable to open master device '/dev/zap/ctl'
> 
> 1 error(s) detected
> 
> FATAL: Error running install command for wctdm
> [root at asterisk1 ~]# ls -l /dev/zap/ctl
> crw-rw----  1 root root 196, 0 Sep 14 12:05 /dev/zap/ctl
> [root at asterisk1 ~]# modprobe wctdm
> [root at asterisk1 ~]# ztcfg -vv
> 
> Zaptel Version: SVN-trunk-r1459
> Echo Canceller: MG2
> Configuration
> ======================
> 
> 
> Channel map:
> 
> Channel 01: FXO Kewlstart (Default) (Slaves: 01)
> Channel 02: FXO Kewlstart (Default) (Slaves: 02)
> Channel 04: FXS Kewlstart (Default) (Slaves: 04)
> 
> 3 channels configured.
> 
> Changing signalling on channel 1 from Unused to FXO Kewlstart
> Changing signalling on channel 2 from Unused to FXO Kewlstart
> Changing signalling on channel 4 from Unused to FXS Kewlstart
> [root at asterisk1 ~]# asterisk -cvvv
> 
> syslog doesn't seem to show anything abnormal:
> 
> Sep 14 12:05:07 asterisk1 kernel: Zapata Telephony Interface Registered on major 196
> Sep 14 12:05:07 asterisk1 kernel: Zaptel Version: SVN-trunk-r1459 Echo Canceller: MG2
> Sep 14 12:05:13 asterisk1 kernel: Freshmaker version: 73
> Sep 14 12:05:13 asterisk1 kernel: Freshmaker passed register test
> Sep 14 12:05:13 asterisk1 kernel: Module 0: Installed -- AUTO FXS/DPO
> Sep 14 12:05:13 asterisk1 kernel: Module 1: Installed -- AUTO FXS/DPO
> Sep 14 12:05:13 asterisk1 kernel: Module 2: Not installed
> Sep 14 12:05:13 asterisk1 kernel: Module 3: Installed -- AUTO FXO (UK mode)
> Sep 14 12:05:13 asterisk1 kernel: Found a Wildcard TDM: Wildcard TDM400P REV I (3 modules)
> Sep 14 12:05:27 asterisk1 kernel: Registered tone zone 4 (United Kingdom)
> Sep 14 12:06:21 asterisk1 kernel: Zaptel Transcoder support loaded
> Sep 14 12:06:21 asterisk1 kernel: Registered tone zone 4 (United Kingdom)
> 
> 
> As you can see, port 4 on the TDM400P is the FXO port, plugged into the BT
> PSTN line.
> 
> When I call this line's number from another phone, here's what I get:
> 
> *CLI>     -- Starting simple switch on 'Zap/4-1'
> [Sep 14 12:12:28] NOTICE[4392]: chan_zap.c:6320 ss_thread: Got event 18 (Ring Begin)...
> [Sep 14 12:12:30] NOTICE[4392]: chan_zap.c:6320 ss_thread: Got event 2 (Ring/Answered)...
> [Sep 14 12:12:31] NOTICE[4392]: chan_zap.c:6320 ss_thread: Got event 18 (Ring Begin)...
>     -- Executing [s at incoming:1] Answer("Zap/4-1", "") in new stack
>     -- Executing [s at incoming:2] Echo("Zap/4-1", "") in new stack
> 
> This is working, since if I "tut" into the phone which originated the call I
> can hear the slightly delayed echo. However, when I put the phone down,
> Asterisk doesn't always notice this. Nothing happens, and if I try to ring
> in again, I get an engaged tone.
> 
> After a minute or two I may then get:
> 
>   == Spawn extension (incoming, s, 2) exited non-zero on 'Zap/4-1'
>     -- Hungup 'Zap/4-1'
> 
> Is there anything I can do to make this more robust?
> 
> Thanks,
> 
> Brian Candler.
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> 
You need BTs SIN351 at http://www.sinet.bt.com/351v4p5.pdf


- --
Ron Wellsted
ron at wellsted.org.uk http://www.wellsted.org.uk
N 52.567623, W 2.137621 Linux Counter No. 202120
FWD:519961
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