32First time installation of the IP Phone 1535

Ping message to the SPS or SLG before sending the REGISTER message.

Note: This option to disable the NAT timer on the IP Phone 1535 is not available in firmware versions below V.0.2.25. You must install the latest firmware version (V2.0.76).

NAT-Traversal:The IP Phone 1535 supports two methods of NAT Traversal - the SIP-PING method and the • STUN method. For more information on configuring NAT-Traversal, see "Configuration of NAT-traversal" (page 32).

—End—

Configuration of NAT-traversal

This section provides a description of NAT-traversal on the IP Phone 1535, and its subsequent configuration.

The IP Phone 1535 supports two methods of NAT-Traversal:

SIP-PING:requires a Border Control Point (BCP) server for the MCS 5100 Release 4.0 and a RTP Media Portal server for MCS 5100 Release 3.5 if it is located behind a NAT/firewall.

STUN: The STUN protocol lets a client discover the presence and type of NATs between the client and the public Internet - a STUN server can be located using DNS to lookup the domain information of the service provider.

Enabling STUN protocol

Step Action

1From the Main Menu, select Settings > VoIP Settings > Proxy > STUN > Enable.

2Press OK.

—End—

Configuring the STUN server

Step Action

1From the Main Menu, select Settings > VoIP Settings > Proxy > STUN > STUN Server.

Nortel Communications Servers

Nortel IP Phone 1535 Installation and Commissioning

NN43160-300 02.03 Standard

Release 4.0/SN10 28 October 2009

Copyright © 2009, Nortel Networks

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Nortel Networks IP Phone 1535 manual Configuration of NAT-traversal, Enabling Stun protocol, Configuring the Stun server