Avaya IP Line User Manual download pdf (Page 168)

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Page 168 of 910 Features

553-3001-365 Standard 4.00 August 2005

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.

The NAT router typically assigns the RTCP port number as RTP port number

+ 1. However, the NAT router is not guaranteed to properly assign the RTCP

port number. When the RTCP port number is not properly assigned, the

RTCP message exchange fails and the Proactive Voice Quality Management

feature does not receive the required RTCP data. A message is printed to the

LTPS console and syslog file and an SNMP trap (ITG3054) is generated.

The NAT Traversal feature attempts a “best effort” approach to initiate the

NAT router to properly assign the RTPC port number. The “best effort”

approach is dependent on the NAT router’s implementation, may vary from

NAT router to NAT router, and cannot be guaranteed by the NAT Traversal

feature.

Configuring NAT Traversal in Element Manager

To configure the Echo Servers IP addresses/port numbers and NAT Keep

Alive time-out setting using Element Manager, in the Element Manager

navigator select IP Telephony > Network Address Translation.

See Figure 36 on page 169.

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