Cisco Unified SRST Versions and Feature Support cisco ccna bootcamp training institute in delhi gurgaon india

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Table 5-4 describes Cisco Unified SRST versions, their protocol support and features, and
the required Cisco IOS Software release.
Table 5-4 Cisco Unified SRST Versions
Feature
CUCM Express
in SRST Mode SRST 4.0 SRST 3.2 SRST 2.1
Minimum Cisco IOS Software
Release
12.4(11)XJ 12.4(4)XC 12.3(11)T 12.2(15)T1
Hunt Group •
B-ACD •
SIP SRST /
Video / /
Voice Security / /
Cisco IP Communicator (CIPC)
Support
/ /
Analog Telephone Adaptor (ATA)
Support
• / •
Local Music On Hold (MOH) • / /
Three-Party Conference / /
The version of the Cisco Unified SRST application depends on which release of the Cisco
IOS Software is running on the router. Each Cisco IOS Software release implements a
particular SRST version. You upgrade to a newer version of SRST through a Cisco IOS
update into router flash. Recent Cisco IOS Software releases often have higher memory
requirements than older ones, so make sure that you look into this before upgrading.
For detailed information on the history of Cisco Unified SRST, refer to the Cisco Unified
SRST Administration Guide or other documents listed in the documentation road map for
Cisco Unified SRST at http://www.cisco.com.
SRST 4,0 Platform Density
The maximum number of IP Phones and directory numbers supported by the Cisco Unified
SRST 4.0 feature depends on which Cisco IOS router platform is used, as shown in Table 5-5.
Dial Plan Requirements for MGCP Fallback and SRST Scenarios 113
Table 5-5 SRST 4.0 Platform Density
Platform Maximum Number of IP Phones Maximum Directory Numbers
1751, 1760, 2801 24 256
2811,26lxXM, 262xXM 36 144
2821,265xXM 48 192
2691 72 288
2851 96 288
3725 144 960
3745 480 960
3825 336 960
3845 720 960
This table shows the maximum number of phones and directory numbers on phones that
a Cisco Unified SRST router can accommodate. For example, a Cisco 3845 Integrated
Services Router can support a maximum of 720 phones and 960 directory numbers on
the phones.
NOTE These maximum numbers of IP Phones are for common SRST configurations
only. Routers with large numbers of IP Phones and complex configurations may not work
on all platforms and can require additional memory or a higher performance platform.