asterisk users - May 2006 - Speeding up UK BT incoming call detection

Hi,

I am running Asterisk v1.2.7.1 with a Digium TE110P. My dialplan is very
simple, when a call comes in on my analogue BT PSTN line, it rings the other
ZAP interface (my house phone). Slightly pointless (having a 1x1 switch) I
know, but I am planning on doing more with internal SIP extensions, and
outgoing SIP services etc.... At the moment it's just simple though whilst I
try to fix this problem.

My problem is that it normally takes 2-3 rings on an incoming call before
Asterisk detects the line ringing and then a further 2 rings before it
starts ringing my phone. I know this because I have plugged a normal
analogue phone into another extension of the BT line as my Asterisk
connected phone starts riniging about 4 or so rings later!

Can anyone tell me what the optimal settings for zaptel.conf and zapata.conf
for a BT line or have any other suggestions to try and speed things up? 

Cheers

Richard Dutton

Isn't a TE110P a PRI card? Are you sure that's the right model number
for an
analogue interface card?

For our sites with BT lines, we have them configured as follows (I've
extracted the settings I think might be relevant):

usecallerid=no
hidecallerid=no
callwaiting=no
callwaitingcallerid=no
threewaycalling=no
transfer=no

immediate=no
busydetect=yes
busycount=8
answeronpolarityswitch=yes
hanguponpolarityswitch=yes

I think disabling asterisk from getting caller ID off an analogue line
improves its answering speed considerably. Of course, if you want CLID info
off your analogue line (and are paying BT for the privilege), you may not
wish to go down this route.

Regards,

Chris
-- 
C.M. Bagnall, Director, Minotaur I.T. Limited
This email is made from 100% recycled electrons

On Tue, May 02, 2006 at 05:39:53PM +0100, Chris Bagnall wrote:

[snip]
> I think disabling asterisk from getting caller ID off an analogue line
> improves its answering speed considerably. Of course, if you want CLID info
> off your analogue line (and are paying BT for the privilege), you may not
> wish to go down this route.
With an analogue line CallerID is presented b/m the 1st and 2nd ring
(which means waiting for 2 rings). Also with Digium hardware to produce
CallerID you have to tell it to do two rings or you get internal s/w
timeouts (Emailed them about it and they never replied).

With UK PRI it should be sent with the call set-up in the data channel,
not the bearers.

Steve

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