Problem with H323

Sorry for my english…

I have a Asterisk server with intalled: Openh323 - Pwlib - Asterisk - Asterisk add-on

Connected with Cisco Voice gateway 3800 Series ( PRI ). Cisco VG is connected with Cisco Call Manager.

When i call from SIP phone to Cisco Phone (CM)
SIP Phone --> Asterisk --> Cisco VG --> Cisco CM --> Cisco Phone

Call it’s ok, but when i call Cisco Phone to Sip phone
Cisco Phone --> Cisco CM --> Cisco VG --> Asterisk --> SIP phone

the call sopped after a few seconds ringing
In asterisk console: ERROR while deconding non-standard cisco extension

If i respond to call, there aren’t comunication, silent and after a few seconds call interruped.

Please help.