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packetization implementation from within the Voice Gateway Media Card)

is implemented in software for the IP Softphone 2050. It runs as part of the

application code on the PC CPU. If the CPU is busy with other tasks, voice

quality can be negatively affected.

The number of buffers used to buffer audio data between the application

and PC audio hardware device driver is adjustable from the Settings >

Sound Devices window. Using fewer buffers reduces the audio path delay

but increases the chances of dropouts and choppy speech, depending on

the speed and utilization of the PC CPU.

This system-wide registry key setting affects other applications and

operating system components but is only effective if Windows QoS Packet

Scheduler is installed. For more information about Windows QoS Packet

Scheduler, see “Windows QoS Packet Scheduler” (page 236).

For Windows 2000 the Windows QoS Packet Scheduler is not installed by

default and the EnablePriorityBoost registry setting is not created.

For Windows XP the Windows QoS Packet Scheduler is installed by

default and the EnablePriorityBoost registry setting is created. The default

setting is 1 (enable QoS).

Windows 2000 and Windows XP require a system-wide registry key to

enable QoS capabilities. You must have Administrator privileges to create

or modify the following value:

HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Qossp/

EnablePriorityBoost

Value 0—do not enable QoS

Value1—enable QoS

Trace utilities can be used to verify QoS settings. See “Ethereal traces”

(page 205).

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

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010