Here's part of the Nortel bulletin regarding the version 3.0 2050 softphone
Introduction
Nortel* is pleased to announce the general availability of Release 3.0 for the IP Softphone
2050.
Release 3.0 of the IP Softphone 2050 delivers new functionality and enhancements
including enhanced security with both signaling and media encryption, expanded wired and
wireless headsets, intra-office mobility with Bluetooth and long range wireless headsets,
click to call from TAPI applications, automated screen pops for incoming calls, scalability
with soft expansion modules, expanded language support, and 30 day try and buy with
software licensing.
IP Softphone 2050 Release 3.0, with its initial general availability, is supported on Nortel
Communication Server 1000 Release 3.0 and later. IP Softphone Release 1.0 and Release
2.0 will continue to be available for other Nortel Communication Servers where support is
offered for the Release 1.0 and Release 2.0 client today. Consult your Nortel representative
for further details on support plans for other Nortel Communication Servers with IP