H323 Nat Address; H323 Portallocation - Cisco Webex DX70 Administrator's Manual

Cisco Webex DX70 and DX80
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Introduction

H323 NAT Address

Define the external/global IP address of the router with NAT support. This address will be
exposed when setting up a call to devices outside your private network. Refer to the H323
NAT Mode setting for details when the NAT Address is used.
In the router, the following ports must be routed to the video conferencing device's IP
address:
* Port 1720
* Port 5555-6555
* Port 2326-2487
Requires user role: ADMIN
Default value: ""
Value space: String (0, 64)
An IPv4 address. It's most often a public IP address, refer to RFC 1918, but it could also
be another private address (e.g. in a larger company network).

H323 PortAllocation

This setting affects the H.245 port numbers used for H.323 call signaling.
Requires user role: ADMIN
Default value: Dynamic
Value space: Dynamic/Static
Dynamic: The system will allocate which ports to use when opening a TCP connection.
The reason for doing this is to avoid using the same ports for subsequent calls, as some
firewalls consider this as a sign of attack. When Dynamic is selected, the H.323 ports
used are from 11000 to 20999. Once 20999 is reached they restart again at 11000.
The ports are automatically selected by the system within the given range. Firewall
administrators should not try to deduce which ports are used when, as the allocation
schema within the mentioned range may change without any further notice.
Static: When set to Static the ports are given within a static predefined range [5555-
6555].
D15362.17 DX70 and DX80 Administrator Guide CE9.14, OCTOBER 2020.
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