5.4.4 DSP Resource Usage
Description
To digitally process audio signals, such as a telephone call, the PBX must use a certain number of DSP (Digital
Signal Processing) resources. DSP resources are provided by the DSP card installed in the PBX. Since there
are a limited number of DSP resources, no further operations (e.g., telephone calls, playing an OGM) can be
performed if all resources are being used.
The following list shows some of the basic operations that require DSP resources.
•
IP extension call
•
IP trunk call
•
Conference
•
Accessing the Unified Messaging system (including recording calls)
•
OGM playback
•
Echo canceller
For IP extension and trunk calls, the number of required resources differs depending on the codec (G.711 or
G.729) used.
Note
The examples in this section are intended to illustrate the concept of DSP resource usage. More complex
situations may necessitate additional resources, and in some cases fewer resources may be necessary.
Examples of DSP resource usage
Fundamentally, the number of resources required for a given situation is the sum of the resources required for
each individual operation. The following examples illustrate DSP resource usage in various situations.
[IP trunk to IP extension]
IP Trunk
IP-PT
X
Y
PBX
G.729A
G.711
If an IP trunk call using the G.729 codec requires X number of resources, and an IP extension call using the
G.711 codec requires Y number of resources, then the number of resources required for a call from an IP
extension to an IP trunk requires X + Y number of resources.
[Unified Messaging access]
IP-PT
Y
X
PBX
G.711
UM
Playing back messages from or recording messages to the Unified Messaging (UM in the figure above) system
requires DSP resources, X in this example, in addition to the resources required for the G.711 codec (Y). The
total cost is X + Y.
Feature Manual
531
5.4.4 DSP Resource Usage
Summary of Contents for KX-NS700
Page 16: ...16 Feature Manual Table of Contents...
Page 17: ...Section 1 For Your Safety Feature Manual 17...
Page 20: ...20 Feature Manual 1 1 1 For Your Safety...
Page 21: ...Section 2 Call Handling Features Feature Manual 21...
Page 59: ...632 Maximum Number of Agents Feature Manual 59 2 2 2 Incoming Call Distribution Group Features...
Page 109: ...Operating Manual References 1 2 1 Basic Calling Feature Manual 109 2 5 4 Trunk Call Features...
Page 195: ...Operating Manual References 1 4 2 Holding a Call Feature Manual 195 2 13 1 Call Hold...
Page 326: ...326 Feature Manual 2 30 2 Outgoing Message OGM...
Page 327: ...Section 3 Unified Messaging System Feature Manual 327...
Page 377: ...Section 4 Network Features Feature Manual 377...
Page 466: ...466 Feature Manual 4 3 6 Network ICD Group...
Page 467: ...Section 5 System Configuration and Administration Features Feature Manual 467...
Page 560: ...560 Feature Manual 5 5 7 PING Confirmation...
Page 561: ...Section 6 Appendix Feature Manual 561...
Page 578: ...578 Feature Manual 6 5 6 PFMPR Software File Version 004 6xxxx...
Page 579: ...Feature Manual 579 Notes...