asterisk users - Apr 2006 - long delay between "Ring Begin" and "SIP/XXX is ringing"

hi all,

i have an asterisk install with a digium 4 port fxo card and cisco 7960
sip phones -- running on a compaq Pentium III (Coppermine) at 800Mhz
256KB cache and 1GB of ram.

when a call comes in on zap/1-1 for example, the delay between when zap
sees the line going to ring state, and when the desktop telephone rings
can be as long as 7000 milliseconds (or about 3 or 4 rings on an ear
piece).

below is some of the log -- note 2 seconds to get from Ring Begin to In
Use and a total of 7 seconds before the sip phone rings.

anyway to speed this process up? 

cheers

charles

Apr  5 16:15:00 DEBUG[7010]: chan_zap.c:6639 do_monitor: Monitor
doohicky got event Ring Begin on channel 1
Apr  5 16:15:02 DEBUG[7010]: chan_zap.c:6639 do_monitor: Monitor
doohicky got event Ring/Answered on channel 1
Apr  5 16:15:02 DEBUG[6986]: devicestate.c:187 do_state_change: Changing
state for Zap/1 - state 2 (In use)
Apr  5 16:15:02 DEBUG[7549]: app_queue.c:471 changethread: Device
'Zap/1' changed to state '2' (In use)
    -- Starting simple switch on 'Zap/1-1'
Apr  5 16:15:05 NOTICE[7548]: chan_zap.c:6063 ss_thread: Got event 18
(Ring Begin)...
<snip>
Apr  5 16:15:07 DEBUG[7012]: chan_sip.c:1447 __sip_semi_ack:
(Provisional) Stopping retransmission (but retaining packet) on
'7c062ef214528d5973dcbe320c3800a1@172.16.7.3' Request 102: Found
    -- SIP/101-7014 is ringing

-- 
"simplified chinese" is not nearly as easy as they would
have you believe ... a superlative oxymoron" --anonymous

> i have an asterisk install with a digium 4 port fxo card and cisco 7960
> sip phones -- running on a compaq Pentium III (Coppermine) at 800Mhz
> 256KB cache and 1GB of ram.
> 
> when a call comes in on zap/1-1 for example, the delay between when zap
> sees the line going to ring state, and when the desktop telephone rings
> can be as long as 7000 milliseconds (or about 3 or 4 rings on an ear
> piece).
> 
> below is some of the log -- note 2 seconds to get from Ring Begin to In
> Use and a total of 7 seconds before the sip phone rings.
> 
> anyway to speed this process up? 
> 
> cheers
> 
> charles
> 
> Apr  5 16:15:00 DEBUG[7010]: chan_zap.c:6639 do_monitor: Monitor
> doohicky got event Ring Begin on channel 1
> Apr  5 16:15:02 DEBUG[7010]: chan_zap.c:6639 do_monitor: Monitor
> doohicky got event Ring/Answered on channel 1
> Apr  5 16:15:02 DEBUG[6986]: devicestate.c:187 do_state_change: Changing
> state for Zap/1 - state 2 (In use)
> Apr  5 16:15:02 DEBUG[7549]: app_queue.c:471 changethread: Device
> 'Zap/1' changed to state '2' (In use)
>     -- Starting simple switch on 'Zap/1-1'
> Apr  5 16:15:05 NOTICE[7548]: chan_zap.c:6063 ss_thread: Got event 18
> (Ring Begin)...
> <snip>
> Apr  5 16:15:07 DEBUG[7012]: chan_sip.c:1447 __sip_semi_ack:
> (Provisional) Stopping retransmission (but retaining packet) on
> '7c062ef214528d5973dcbe320c3800a1@172.16.7.3' Request 102: Found
>     -- SIP/101-7014 is ringing
It would appear the progress is associated with waiting for callerid 
info. If you are in the US, callerid occurs between the first and second 
ring. That's about 7 seconds or so.

If your pstn line does not have callerid, then add statements into your 
zapata.conf file like 'usecallerid=no', 'immediate=yes', etc. I
don't
recall exactly which statements are needed, but start with the above two 
and see what you get for delays.