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5.5.4.1 DSP Resource Reservation
Description
A number of resources can be reserved for particular features or services to guarantee a minimum level of
service. Resources reserved for a particular service (e.g., conferencing) cannot be used for another service
(e.g., Unified Messaging).
For example, one may want to reserve resources for OGM (Outgoing Message) to ensure that recorded
messages can be played to incoming calls.
The resources can be reserved for the following types of services:
•
VoIP (G.711)
•
Conference trunk
•
Unified Messaging
•
Two-way Recording
•
OGM
Note
It is not necessary to reserve resources for a feature to use it. In normal operation, free DSP resources
are allocated on a first-come first-serve basis. Resources should be reserved only if a minimum level of
performance is required for your system.
For example, reserving resources for Two-way Recording (
®
3.2.1.4 Automatic Two-way Recording for
Manager,
®
3.2.2.34 Two-way Record/Two-way Transfer) also reserves UM ports. This can have the
unintended effect of blocking access to the Unified Messaging system even when no recording is being
performed. Therefore, resources for Two-way Recording should be reserved only if it is necessary to
guarantee that Two-way Recording can be performed. (
®
3.1.1 Unified Messaging System Overview)
Resource Reservation Example
The following table shows the number and types of resources that must be reserved for a given workload. To
calculate the number of free (i.e., non-reserved) resources, a DSP M card (127 DSP resources) is assumed.
Service
Minimum
performance
*1
Resources per unit of
performance
No. of required DSP
resources
VoIP call (G.711) 40 calls 1 40
Unified Messaging
*2
5 operations 1.3 6.5
Two-way Recording 3 recordings 2.3 6.9
OGM 10 playbacks 2 20
Conference trunk 10 conferences 0.5 5
Unified Messaging tone
*3
2 tones 2 2
Total Reserved Resources 80.4
Free Resources
*4
47
*1 Minimum performance refers to the minimum number of simultaneous operations.
*2 Unified Messaging operations include operations such as users (subscribers) accessing their mailboxes and outside callers leaving
messages in subscribers’ mailboxes.
*3 The resources for Unified Messaging tones (used for Two-way Recording) are reserved automatically and cannot be released.
*4 Free Resources = DSP capacity – Total Reserved Resources, rounded to the nearest whole number.
If the PBX’s resources are reserved as shown in the example above, the resources required to meet the
numbers of operations listed in the "Minimum performance" column are guaranteed to be available. Note,
however, that for an operation such as a conference call, DSP resources are required for each individual
conference party in addition to the resources required for the conference trunk itself. Therefore, if all 40 VoIP
Feature Guide 497
5.5.4 DSP Resource Usage