Example Network Address Translation Configuration; Use The Corporate Directory - Polycom CX5500 Administrator's Manual

Polycom CX5500 Unified Conference Station Administrator's Guide
1.1.0

Example Network Address Translation Configuration

The following illustration shows the default NAT parameter settings. The parameter nat.ip is the public
IP that you want to advertise in SIP signaling. The default IP is 120.242.6.155.
The parameter nat.mediaPortStart is the RTP used to send media. If non-Null, this attribute will set
the initially allocated RTP port and will override the value set in
tcpIpApp.port.rtp.mediaPortRangeStart. In the example, the starting port is 12500 and the
phone will cycle through start-port + 47 for phones that support audio only or start-port + 95 for phones
that support video.
The parameter nat.signalPort specifies the port that the phone will use for SIP signaling. This
parameter will override voIpProt.local.Port. In the example below, the phone will use port 5070 for
SIP traffic.
Use the nat.keepalive.interval to specify the keepalive interval in seconds. This parameter sets
the interval at which phones will send a keepalive packet to the gateway/NAT device. The keepalive
packet keeps the communication port open so that NAT can continue to function as initially set up. In the
example below, the phone will send the keepalive every 120 seconds.

Use the Corporate Directory

You can connect your phone to a corporate directory server that supports the Lightweight Directory
Access Protocol (LDAP) version 3. The corporate directory is a flexible feature and table Use the
Corporate Directory links you to the parameters you can configure. Once set up on the phones, the
corporate directory can be browsed or searched. You can call numbers and save entries you retrieve
from the LDAP server to the local contact directory on the phone.
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