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Cisco IP Telephony Solution Reference Network Design
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Chapter 6 Call Processing
Device Weights
·
You can configure a maximum of 2500 CTI connections or associations per MCS 7845 or equivalent
server, or a maximum 10,000 per cluster if they are equally balanced among the servers.
·
The maximum number of H.323 calls is limited by device weights. (See
.)
·
Each cluster can support up to 30,000 IP phones.
·
Each cluster can support a total of up to 40,000 device weight units.
Device Weights
shows the base device weight for each device type, based on the consumption of memory and
central processing unit (CPU) resources.
Table 6-2
Base Device Weights
Device type
Weight per Session or
Voice Channel
Session or DS0
per Device
Cumulative
Device Weight
IP phone
1
1
1
Analog MGCP ports
3
Varies
3 per DS0
Analog SCCP ports
1
Varies
1 per DS0
CTI route point
2
Varies
Varies
1
1.
Cumulative weight of CTI route point depends on the associated CTI ports used by the application.
CTI client port
2
1
2
CTI server port
2
1
2
CTI third-party control
2
2.
Includes the associated IP phone.
3
1
3
CTI agent phone
6
1
6
H.323 client
3
Varies
3 per call
Intercluster trunk gateway
3
Varies
3 per call
H.323 gateway
3
Varies
3 per call
Digital MGCP T1 gateway ports
3
24
72 per T1
Digital MGCP E1 gateway ports
3
30
90 per E1
Music on hold (MoH) stream
10
20
200
3
3.
When MoH is installed on the same server as Cisco CallManager, the maximum number of streams is 20.
Transcoding resource
3
Varies
3 per session
Media Termination Point (MTP)
(software)
3
24
72
4
4.
When installed on the same server as Cisco CallManager, the maximum number of conference sessions is 24.
Conference resource (hardware)
3
Varies
3 per session
Conference resource (software)
3
24
72