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Cisco Unified SRST Versions and Feature Support

Table 5-2 describes Cisco Unified SRST versions, their protocol support and features, and the required Cisco IOS Software release.

Table 5-2. Cisco Unified SRST Versions

Feature

CUCM Express in SRST Mode

Cisco Unified SRST 8.0

Cisco Unified SRST 7.2

Cisco Unified SRST 4.3

Minimum Cisco IOS Software Release

12.3(11)XJ 15.0(1) for version 8.0

15.0(1)XA

12.4(22)YB 15.0(1)M on ISR G2

12.4(11)XZ

Presence

u2713.gif

Extension Mobility

u2713.gif

Eight active calls per line

u2713.gif (new in 8.0)

u2713.gif

u2713.gif

u2713.gif

Support for E.164 numbers with + prefix

u2713.gif (new in 8.0)

u2713.gif

u2713.gif

Five additional MOH* streams (SCCP only)

u2713.gif (new in 8.0)

u2713.gif

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 about Cisco Unified SRST versions and their hardware and feature support, refer to the Cisco Unified Survivable Remote Site Telephony Version 8.0 data sheet at www.cisco.com/en/US/prod/collateral/voicesw/ps6788/vcallcon/ps2169/data_sheet_c78-570481.html.

SRST 4.0 Platform Density

The maximum number of IP Phones and directory numbers supported by the Cisco Unified SRST 8.0 feature depends on which Cisco IOS router platform is used, as shown in Table 5-3.

Table 5-3. SRST 8.0 Platform Density

Platform

Maximum Number of IP Phones

800 Series

4

1861

15

2801–2851

25–100

2901–2951

35–250

3825, 3845

350, 730

3925–3945E

730–1500

Table 5-3 shows the maximum number of phones and DNs on phones that a Cisco Unified SRST router can accommodate For more details, such as minimum memory requirements, see Cisco Unified SRST 8.0 Supported Firmware, Platforms, Memory, and Voice Products at www.cisco.com/en/US/docs/voice_ip_comm/cusrst/requirements/guide/srs80spc.html.

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