Ip Addresses And Connectivity - AT&T Synapse Installation Manual

Synapse Installation Guide

IP Addresses and Connectivity

An IP address is an individual numeric identification assigned to devices on a computer
network. At least one Synapse device needs a network-assigned IP address on the subnet
shared with any computers that will allow access to the WebUI. Valid IP addresses on the
same subnet allow devices on the network to identify each other and enable
communication.
This IP address may be assigned from a Dynamic Host Configuration Protocol (DHCP)
server, or set statically to the same subnet, and will be separate from the self-assigned
169.254.xxx.xxx link-local address that the Synapse devices use to communicate with
each other. When setting up the IP address on a Synapse device, this network IP address
used for WebUI connectivity is the only address you can change.
The network IP addresses can be assigned in two ways:
1. The Synapse device can request a network server to automatically assign an IP
address. This IP address is a dynamic assignment; the address is on lease from the
server. The lease is renewed as long as the device remains connected and there is
no change to the network. However, if the device is disconnected, or if there is a
network or AC power interruption, the lease may not be renewed (that is, the IP
address expires) and a new IP address may be assigned.
Most LANs use servers to automatically assign IP addresses. Synapse defaults to
assuming that this automatic assignment will occur.
2. The Synapse Administrator can manually assign a static system IP address. This IP
address does not change, even when there are network or AC power interruptions.
Some installations will require manual static IP assignment. You can assign a static
IP address for a Gateway or ATA using the device front panel interface. See
Configuration" on page
A switched-network topology is recommended. This topology refers to the network
virtual shape or structure and does not necessarily reflect the physical layout. Switched
networks involve connecting the network components to switches rather than hubs; this
improves network communication.
SIP Gateway Static IP Configuration
If your SIP service provider requires static registration for a SIP Gateway, please ensure
that:
The SIP Gateway uses the same IP address, preferrably via a static mapping in

the DHCP Server. If this is not possible, you can configure a static IP address
using the SIP Gateway's front panel.
Port forwarding on your router is configured to route UDP 5060 traffic from the

WAN side to the SIP Gateway LAN IP address.
Installation
Some servers have default settings that limit the number of network IP
addresses assigned to devices on the network. You should log in to your server
to confirm that the IP range is sufficient to accommodate at least one of the
Synapse devices that you are adding as at least one Synapse device needs an
assigned IP address to enable WebUI configuration activities. Consult the IT
department if you need help checking the server.
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