Configuring Maxcs Behind Nat - Altigen ACM 6.7 Administrator's Manual

When different IP devices using various codecs connect to the server through a
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Public Pipe, the system will aggregate the total bandwidth of all connections. If the
total bandwidth exceeds that specified in the Bandwidth for VoIP box, the system
will reject additional connection requests.
Configuration example
Suppose your company has a T1 line configured as half voice PRI and half data service.
There are 12 remote employees using IP phones connecting to the AltiGen system.
Because bandwidth is limited, you would like to regulate the bandwidth used by VoIP.
You have set up remote IP phones using G.729 with 20ms frame, and you want to limit
the number of concurrent VoIP sessions to 6. If you enter 180 in the Bandwidth for
VoIP field, the system will show that 6 G.729 sessions are allowed.

Configuring MAXCS Behind NAT

Your MAXCS system should be inside a firewall/NAT router. If your MAXCS is supporting
remote IP phones, IPTalk or AltiClients, you need to configure MAXCS and the NAT router
to make MAXCS work properly behind NAT. Port forwarding configuration on the firewall/
NAT router is required. If you're not sure how to configure your firewall/NAT router,
please consult your firewall/NAT router manual or vendor. AltiGen Technical Support will
not be able to help with this.
Important:
If your firewall/NAT router supports SIP, you need to FULLY disable
this feature on the firewall/NAT router, or conflicts may occur
between MAXCS and the firewall/NAT router. In this case, remote IP
phones might not work or might behave strangely. Again, please
consult the firewall/NAT manual to find out how to do this.
Take the following steps:
1. Make sure the MAXCS system uses a private static IP address, for example,
10.10.0.8. Do not use DHCP on the MAXCS system.
2. Define the range of the local IP addresses (see "To define an address range" on page
326). Make sure the MAXCS system is included in the range. If the range is not
defined correctly, all the IP phones will not work.
3. Set local IP network ranges to private. Multiple private networks can be added.
4. On the IP Networks tab, in the NAT Support panel, check Enable SIP NAT
support and Enable H323 NAT support. Except, if the NAT router is H.323-aware
(for example, a Fortinet router) do not enable H323 NAT support.
MAXCS ACM 6.7 Administration Manual 327
Defining IP Networks