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Cisco Voice GW Inbound Call Delay

I have a Cisco 2811 setup as a voice gateway with 4-FXO ports and 7 7941 phones with a built in 16 port POE switch module. All of this works fine except for long delays with respect to processing inbound calls. To verify this I set up an external POTS telephone just outside the FXO port.  The phone may ring 3 to 4 times before the call is processed through the voice gateway to and IP phone. This occurs about 60 percent of the time otherwise the call rings through just after the first ring of the external POTS phone. This is not affected by call volume the results as described above occur with no external or internal calls in session.
This is not a problem I have encountered in the past working with these gateways and I would appreciate any suggestions you could offer to solve this issue.

IOS Ver 12.4(13r)T

Cisco 2811 (revision 53.51) with 245760K/16384K bytes of memory.
Processor board ID FTX1144A15W
18 FastEthernet interfaces
1 Serial interface
1 Channelized T1/PRI port
1 Virtual Private Network (VPN) Module
4 Voice FXO interfaces
2 Voice FXS interfaces
1 802.11 Radio
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)
1 Solution
I'm assuming you are running CME? Can you post your config?
Are you using PLAR to ring specific phones, or a hunt group, or AA, or what?
SgtPepper1955Author Commented:
I looked some more into this problem and by shorting the time caller ID has to reconcile a remote callers ID and disabling Fax detection has seemed to fix this problem.
voice-port 0/2/0
 trunk-group outbound
 no battery-reversal
 connection plar opx 100
 caller-id enable type 1

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