Need to test a bunch of FXO cards.

I am tasked with testing a bunch of FXO cards (VIC-2FXO) and I have a 1760 router with an FXS card in it. I configured the router so that when I call from an IP phone (ext 4000) to the FXS card port 1/0 (ext 4015) it calls the FXO card on port 0/0 which uses plar to ext 4444 which is port 1/1 on the FXS card.
I also tried to plar calls to ext 4001 an IP phone.
When I call 4015 from the IP phone, it rings the 4444 extension once then the FXS port 1/0 (ext 4015) hangs up. A call remains between the FXO port 0/0 and the FXS port 1/1 but since the FXS port 1/0 dropped off you can not talk to the IP phone.
4001 calls ---> 4015 FXS 1/0 which rings ---> FXO 0/0 using PLAR rings ---> 4444 which is on FXS port 1/0
The port light for FXS 1/0 comes on during the call proces but then goes out. The port lights for the FXO 0/0 and FXS 1/1 stay light until I unplug th RJ11 cable between them.
Any ideas how I can keep FSX 1/0 from dropping one the call is answered on FXS 1/1?
Current configuration : 1917 bytes
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname Router
boot-start-marker
boot-end-marker
no aaa new-model
memory-size iomem 15
voice-card 0
voice-card 1
interface FastEthernet0/0
ip address 192.168.69.200 255.255.255.0
speed auto
voice-port 0/0
connection plar 4444
voice-port 0/1
voice-port 1/0
station-id number 4015
voice-port 1/1
station-id number 4444
dial-peer voice 400 pots
destination-pattern 4015
port 1/0
dial-peer voice 200 pots
incoming called-number .
port 0/0
dial-peer voice 444 pots
destination-pattern 4444
port 1/1
telephony-service
max-ephones 6
max-dn 6
ip source-address 192.168.69.200 port 2000
auto assign 1 to 6
max-conferences 4 gain -6
transfer-system full-consult
create cnf-files version-stamp Jan 01 2002 00:00:00
ephone-dn 1 dual-line
number 4000
ephone-dn 2 dual-lin
number 4001
ephone 1
no multicast-moh
mac-address 000A.8AF0.3016
type 7960
button 1:1
ephone 2
no multicast-moh
mac-address 001B.535C.CABD
type 7940
button 1:2
line con 0
line aux 0
line vty 0 4
login
end
Thanks

Michael,
I have seen issues like this and its all dow to actual physical wiring.
Your 2 port FXS & FXO cards have 2 lines available on each port.
Can you ensure that you wire everything as a single 2 wire.
FXS 1/0 RJ11 PIN3 ------------------------------------------------- FXO 0/0 PIN 3
FXS 1/0 RJ11 PIN4 ------------------------------------------------- FXO 0/0 PIN 4
FXS 1/1 RJ11 PIN3 ------------------------------------------------- EXT 4444
FXS 1/1 RJ11 PIN4 ------------------------------------------------- EXT 4444
Do not put through any other wires
Regards,
Alex.
Please rate useful posts.

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