H.323 endpoint to analog phone call problem

I have Tandberg H.323 endpoints registered in gatekeeper, Callmanager 4.2(1) and MGCP voice gateway to classic telephony. There is a problem, when I try to set up a call from H.323 endpoint to the analog phone through voice gateway. The call is set up but disconnets after about 3 seconds alerting signal. However you can have normal connection, when you answer the phone during theese three seconds of alerting. When it disconnects it says: 'Resource unavailable, unsecified'.
What can cause such problem?
Thanks in advance.

NO, I was using an Sx-20 as the H323 endpoint. I tried a different video confernece unit.The other confernce unit worked with out any issues. Sorry I wish I new what was wrong with the sx-20. What kind of h323 endpoint are you using?

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