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Incoming call disconnects on FXO port after few minutes

 

I have analogue line connected to FXO port on Cisco 2851 router which is then forwarded to number 1000 on CUCM (H323 connection)
All incoming calls get disconnected after 2-3 minutes (time from beginning of the call to disconnection is variable). i tried changing analogue lines and providers but it makes no difference.


This is the configuration on 2851

voice-port 0/3/3
 supervisory disconnect dualtone mid-call
 no battery-reversal
 cptone CZ
 timeouts call-disconnect 1
 timeouts wait-release 2
 connection plar 9007
 impedance complex2
!
dial-peer voice 1103 voip
 destination-pattern 9007
 session target ipv4:10.0.14.90
 voice-class h323 1
 codec g711ulaw
 no vad
!
dial-peer voice 999033 pots
 incoming called-number .
 port 0/3/3
!


Any idea what could be the reason ?

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