4200 User Manual Edgewater Networks, Inc.
Version 3.0 15
VoIP ALG
An application-layer gateway provides basic proxy features. Serving as an
ALG proxy, the system maps many network appliances into one or more
public IP addresses and provides the connectivity and management for IP
phones. The ALG must first recognize and register a network appliance before
it presents the IP telephone or data device through its public WAN port. The
system contains an MGCP, SIP and H.323 call-control proxy ALG. VoIP phones
and client adapters have to be configured to point to the system, which
serves as a call-control server, proxy, gatekeeper or gateway. For corporate
customers with high-end routers and firewalls, the system can be configured
as a VoIP Application Layer Gateway only. This allows all of the normal data
traffic to continue to be handled by the existing network devices, and
voice/video traffic to be handled by the system. For this configuration, the
system WAN Ethernet port is connected to the internet. The system LAN
Ethernet port is connected to a port on the desired LAN Ethernet switch. The
system can reside on one subnet and be accessed by VoIP devices on other
subnets through the router.
⇒
Select VoIP ALG.
o TFTP server IP address --
This allows the system to act as a TFTP
server providing subsequent configuration information to other VoIP
phones or devices.
o Use ALG Alias IP Address --
Enter the IP address on the LAN that
endpoints communicate with. Generally, this is the same as the LAN IP
address. In some cases, the ALG addresses will not correspond to the
addresses of the LAN or the WAN ports (e.g. when VRRP is enabled).
The addresses will be alias addresses that have been configured on the
ports. In general, the user should leave this feature disabled. Check
this box to enable the below IP parameters to be changed.
Note; VRRP is only supported in the 5300 and 6400
platforms.
Enable Use ALG Alias IP Address and Submit
o ALG LAN Interface IP --
Enter the IP address on the LAN
that endpoints communicate with. Generally, this is the same
as the LAN IP address.
o ALG WAN Interface IP --
Enter the IP address on the WAN
that communicates with the soft switch. Generally, this is the
same as the WAN IP address.
Note; ALG is enabled on your system, which allows the
system to recognize and register a network appliance
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