We are connecting to DMCC on unsecure port 4721. When we register device by invoking RegisterTeminal we are getting error on OnRegisterTerminalResponse event that says 'Communication Manager does not support TLS for H323 end point'. We are using main dependency mode and client mode for media control. Do we need to connect to DMCC start application session using secure port? Your help is greatly appreciated

More recent release of AE Services uses TLS by default when registering the H.323 device with Communication Manager. Nothing you do between your application and AE Services impacts that.

See the topic of "Secure H323 Connection" in the AE Services Administration guide for the release you are working with.
e.g., for Release 8.0.1
https://www.devconnectprogram.com/fileMedia/download/1b068831-3168-4a02-95d2-efeb2f3d859d

You could also change what Communication Manager's configuration is (assuming the release supports it). I believe this is configured on the ip-network-region form.

The simplest way to overcome this is probably to edit the Switch Connection on the AE Services web interface (Communication Manager Interface -> Switch Connections). Untick the "Secure H323 Connection" option and Apply. You may need to restart the DMCC service.

Martin

Thank you John and Martin for your quick response.