User`s guide

6-6 Preliminary November 23, 1998 MultiVoice Gateway for the MAX— User’s Guide
Configuring MultiVoice
Configuration options
Type of Service (TOS) management
This group of parameters allows you to change the Precedence bits (bit0 - bit2) and the TOS
bits (bit3 - bit6) for the Type of Service (TOS) byte use by UDP voice packets. In networks
which support processing IP packets based on precedence, the Type of Service byte is used to
attain a certain level of UDP packet processing by manipulating values for delay, throughput
and reliability.
Type of Service is an eight (8) bit parameter found in the header of an IP datagram. It is
divided into three fields, containing the following values:
Bits 0-2: Precedence.
Bits 3-6: TOS (performance cost).
Bit 7: Reserved for Future Use.
The TOS Enabled parameter enables/disables user configuration of the Type of Service byte.
By setting the value for TOS Enable to Yes, you may change TOS byte by assigning values to
the Precedence and TOS parameters. You may toggle the value for TOS Enabled between Yes,
to enable operator configuration of the ToS byte, or No, to disable this feature. This value
defaults to Yes. Changes to this value become effective with the next call.
The Precedence parameter sets the importance or priority of the UPD packet, bit0 through bit2
of the Type of Service octet. This is represented by a Hexadecimal value, which defines how
the network will process the UDP packets.
These are requested values. The impact of a selected value on UDP packet processing is
network dependent (see RFC791). This value defaults to 101. Changes to this parameter take
effect the next MultiVoice call.
The TOS parameter controls processing attribute management, bit3 through bit6 of the Type of
Service octet. These bits denote how the network should make trade-offs between throughput,
delay, reliability and cost when processing the UDP packets.
These are requested values. The impact of a selected value on UDP packet processing is
network dependent (see RFC1349). This value defaults to Minimize Delay. Changes to this
parameter take effect the next MultiVoice call.
Limiting the Gateway’s call volume
The Max VOIP Calls parameter is used to reduce the maximum number of MultiVoice calls a
Gateway can process, by reducing the number of available Digital Signal Processors (DSPs).
Any number between 1 and the maximum number of DSPs installed on the MultiVoice
Gateway may be assigned to this parameter. This value defaults to the maximum call volume
for the installed MAX platform. Changes to this value become effective with the next call. This
feature is useful when continued high call volumes on a network affect the call quality.
Adjusting the value for Max VOIP Calls will allow a MultiVoice Gateway to allocate more
system resources to processing fewer calls, resulting in improved call quality.
Note: When active calls exceed the Max VOIP Calls limit, the caller will hear a busy signal
from the MultiVoice Gateway.
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PRECEDENCE TOS 0