Avaya Nortel Communication Server 1000 Manual page 122

122 Features
Users who attempt to use an IP Phone with VLAN enabled on a NAT router
that does not support VLAN cannot connect to the CS 1000 system. If
DHCP is used, the IP Phone cannot even obtain an IP address.
Most NAT routers do not support 802.1Q Tagging. If 802.1Q Tagging is not
supported on the NAT device, the check box Enable 802.1Q support in Element
Manager Node Summary Page under the "QoS" Section must be left unchecked.
See
(page
Phones can send the initial "Resume Connection" message, but then the IP
Phones reset and no call path is established.
Figure 31
802.1Q Tagging on Node Summary page in Element Manager
NAT Traversal and Proactive Voice Quality Management
Real-Time Control Protocol (RTCP) signaling provides statistics (for
example, latency, packet loss, and jitter) about the Real-Time Transfer
Protocol (RTP) stream. For the RTCP signaling to be successful, the
PUBLIC RTCP port number must be the RTP port number + 1. For example,
if the PUBLIC RTP port is 12000, then the PUBLIC RTCP port must be
12001.
Copyright © 2003–2008, Nortel Networks
.
Figure 31 "802.1Q Tagging on Node Summary page in Element Manager"
122). If 802.1Q Tagging is enabled for IP Phones behind NAT, the IP
Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008
ATTENTION