TANDBERG MCU 4500, MSE 8510 manual Upgrading the firmware and you have checked, settings

Allow/reject incoming and outgoing calls to the	Disabling this option will prevent calls using SIP
MCU using SIP over UDP or change the port that	over UDP.
is used for this service.
	If a port is disabled, this option will be
	unavailable.
	You must use the same port number for both
	Port A and Port B. The number is automatically
	refreshed for Port B. You cannot change the Port
	B UDP port numbers and they are always grayed-
	out; if you want to allow incoming and outgoing
	SIP (UDP) calls on Port B, ensure that you have
	the video firewall as an activated feature (refer to
	Upgrading the firmware) and you have checked
	the tickbox for SIP (UDP) on Port B.
Enable/disable the receiving of the SNMP	If a port is disabled, this option will be
protocol on this port or change the port that is	unavailable.
used for this service.
	You must use the same port number for both
	Port A and Port B. The number is automatically
	refreshed for Port B. You cannot change the Port
	B UDP port numbers and they are always grayed-
	out; if you want to enable the receiving of the
	SNMP protocol on Port B, ensure that you have
	the video firewall as an activated feature (refer to
	Upgrading the firmware) and you have checked
	the tickbox for SNMP on Port B.
	Note that by default SNMP Traps are sent to port
	UDP port 162 (on the destination network
	management station); this is configurable. For
	more information, refer to Configuring SNMP
	settings.
Enable/disable access to the built-in H.323	If a port is disabled, this option will be
gatekeeper or change the port that is used for the	unavailable.
built-in H.323 gatekeeper.
	You must use the same port number for both
	Port A and Port B. The number is automatically
	refreshed for Port B. You cannot change the Port
	B UDP port numbers and they are always grayed-
	out; if you want to open Port B for the H.323
	gatekeeper, ensure that you have the video
	firewall as an activated feature (refer to
	Upgrading the firmware) and you have checked
	the tickbox for H.323 gatekeeper on Port B.

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