[asterisk-users] how to determine the remote IP address when dialing in ooh323

[VoIP User]

 Dear Colleague,

please help me. I need to authorize the incoming H.323 calls by IP address.
There are two options.
1. To configure the ooh323 to send the calls to different contexts for
different IP addresses
2. To determine the remote IP and then use external script with it.

Unfortunately I can not find a way to do any of these options. I remember,
the OH323 had varialbles like ${OH323_RADDR} which contains the remote IP.
But how can I do find it in ooh323?

Thank you in advance.
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