Incoming calls get disconnected on FXO port after few minutes

[blive56133]

I have analogue line connected to FXO port on Cisco 2851 router which is then forwarded to number 9007 on CUCM (H323 connection). On 9007 there is IVR which is redirected to a fixed phone.
All incoming calls get disconnected after 2-3 minutes (time from beginning of the call till disconnection is variable, although it disconnects during the conversation with employee on a fixed phone, never during the IVR prompt). 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
 description *** CC - Outgoing VoIP VIP 1296 ***
 destination-pattern 9007
 session target ipv4:10.0.14.90
 voice-class h323 1
 codec g711ulaw
 no vad
!
dial-peer voice 1104 voip
 preference 1
 destination-pattern 9007$
 session target ipv4:10.64.0.90
 voice-class h323 1
 dtmf-relay h245-alphanumeric
 codec g711ulaw
 no vad
!
dial-peer voice 999033 pots
 incoming called-number .
 port 0/3/3
!

Any idea what could be the reason ?

[Jayanth Velkuri]

are the calls forwarded to 1000 or 9007 ?

pls collect

deb h225 asn1

deb h245 asn1

deb voip ccapi inout

deb vpm sign

[blive56133]

I'm sorry for the mistake, calls are sent to 9007.

As for the debug commands, should I make 4 different calls, each for one type of debug or should I turn on all of them at once and make 1 call?

[Jayanth Velkuri]

just make one call 

send the call details and also enable , deb ip tcp trans

pls disable all debs after the test call

[blive56133]

I'll do as you told me in the evening (it's easier to collect it after working hours because we have many calls now)

[Jayanth Velkuri]

Oct  7 21:48:56.057: htsp_process_event: [0/3/3, FXOLS_CONNECT, E_DSP_SUP_DISCONNECT]fxols_conn_sup_disc
Oct  7 21:48:56.057: htsp_timer2 - 30000 msec

try below under voice port

no supervisory disconnect dualtone mid-call
sh
no sh

[blive56133]

I did and it seems it works. I just had 2 conversations that lasted over 6 minutes.

thanks!

if it's not a problem can you explain what this means 

Oct  7 21:48:56.057: htsp_process_event: [0/3/3, FXOLS_CONNECT, E_DSP_SUP_DISCONNECT]fxols_conn_sup_disc
Oct  7 21:48:56.057: htsp_timer2 - 30000 msec

[Jayanth Velkuri]

good ,looks like some sort of supervisory disconnect was happening

[blive56133]

output of the debug commands is in the attachement