Main Control Unit Rear Panel; Network Provisioning; Routers; Firewalls - Inter-Tel InterPrise 3200D User Manual

Main Control Unit Rear Panel

Network Provisioning

Routers

When a Voice over IP (VoIP) device communicates through a router, it is highly recommended
that the router be able to prioritize the packets. Since the voice packets have to reach the
destination in "real time" it is important for the router to pass the voice packets through before any
other data. In some configurations, a dedicated serial or Ethernet port is available on the router
for the VoIP traffic. In this case, the router needs to prioritize the traffic from that physical
interface over all other interfaces.
If the VoIP device is talking to the router through the same physical Ethernet interface as the LAN
traffic, then you need to prioritize the VoIP traffic by TCP and UDP port numbers. When installing
or configuring the router(s) used to pass the VoIP traffic, here are the port numbers you should
prioritize:
UDP port 16384 (audio)
UDP ports 5000-5018 (call control)

Firewalls

If your firewall is using a fully qualified set of IP addresses, then you simply need to open up the
ports listed above to allow the inbound voice traffic through. If you are using NAT, then you need
to be able to "map" or "bind" the above ports to the IP address of the InterPrise 3200D.

Proxy Servers

If you intend to pass Voice over IP traffic through a Proxy server, the server needs to be capable
of providing proxy services for any IP device, not just Windows PCs. Some proxy servers require
a client-side application on any IP-based unit that needs access through the firewall. InterPrise
3200D is not a Windows PC, as many proxies require. Therefore, an alternate path for the Voice
over IP traffic may need to be established.
InterPrise 3200D March 2002