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218 Nortel IP Softphone 2050

QoS settings

The IP Softphone Version 1 includes a QoS tab in the Configuration utility.

You can enable or disable 802.1Q/p settings. The QoS tab provides the

following settings:

•

Enable—sends 802.1Q/p whether it is supported by the network or not

•

Disable—does not send 802.1Q/p whether it is supported by the

network or not

• Automatic Detection—sends 802.1Q/p packet, which requires a

response from the TPS. If the TPS replies, 802.1Q.p is used. If the

TPS does not reply, the same packet is sent without 802.1Q/p. If the

TPS replies, then 802.1Q/p is not used.

To prevent improper assignment of these settings, this tab is removed in

IP Softphone Version 2. The 802.1Q p settings are automatically detected.

QoS is otherwise supported in IP Softphone 2050 Version 2 as it was in IP

Softphone 2050 Version 1.

Application thread priorities

Priorities are determined by thread priorities. The i2050QosSvc.exe

application consists of threads, which run the Graphical User Interface

(GUI) and audio threads. Thread priorities increase from the base priority

of the process, as needed. The audio threads boost to high priority, as

recommended by Microsoft, while the GUI maintains a normal priority.

Increasing the process priority implies that the operating system may not

perform properly. This concern restrains the IP Softphone 2050 to use

Windows recommended priorities to avoid an unpredictable degradation

in general OS performance.

Codec

The IP Softphone 2050 provides the following codecs:

•

G.711 provides the highest quality (if the network facilities can handle

the packet flow) because there is no compression.

• G.729 is ranked best; it has 8:1 compression but no voice activity

detection.

Frame size

The IP Softphone 2050 supports the following range of frame sizes

• G.711-64 A-law and µlaw: 10-960—10 ms increments

• G.729A: 10-960—10 ms frames

• G.729AB: 10-960—10 ms frames

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 02.07

5 February 2009