Orion-VX1000 User Manual
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TCP port 5061 (for SIP TLS)
TCP and UDP ports [1720 - 17xx] for H.323. (17xx = 1720+Number of Additional H.323 ports)
9.3.3
RTP Traffic Ports Range
The range of the UDP ports for the incoming and outgoing RTP packets need to remain open in
the firewall/NAT. Orion-VX1000 communicates through:
UDP 10000-11000
UDP and TCP 12000-12500
The actual range can be restricted within the default one, depending on number of conferences,
participants per conference, conference type and Orion-VX1000’s model you are using.
9.4
NAT Traversal in Orion-VX1000
9.4.1
Near-End NAT Traversal
In a deployment scenario where Orion-VX1000 is located behind a firewall and is configured with
private IP address, the signaling sent from the Orion-VX1000 messeges will contain private IP
addresses. Unless the firewall provides VoIP NAT Traversal services, sessions will not connect, as
the singling messeges will contain non-routable addresses. This issue is called Near-End NAT
traversal, as the problem to be solved is “near” – meaning the close firewall.
Orion-VX1000 solves this problem by providing near-end NAT traversal as part of the Orion-
VX1000. The private IP addresses within the SDP are replaced by the NAT’s public IP address and
the clients receive SIP messages which include SDP with accessible public IP addresses, providing
session completion.