Specifications

4-24 Chapter 4: Collaboration
* The number of phones supported by SRST have been changed to multiples of 5 starting with Cisco IOS Software
Release 12.4(15)T3.
** The Cisco Catalyst 6500 Series CMM supports Cisco Unified SRST 4.0 with Cisco IOS Software Release 12.4, and Cisco
Unified SRST 2.1 with Cisco IOS Software Release 12.2(13)ZC.
*** There are no corresponding part numbers, but you can purchase multiple parts to reach the desired phone count.
For More Information
For more information about Cisco Unified SRST, visit: http://www.cisco.com/go/srst.
The Cisco Unified SIP Phone 3911 is an affordable, entry-level single-line SIP-based endpoint that is designed
for environments with low communication needs such as lobbies, hallways, cafeterias, classrooms and can be
used within retail and manufacturing environments.
The Cisco Unified SIP Phone 3911 can grow with the organization whether it is a small, mid-sized or large
enterprise business. Easy to administer and maintain, the endpoint includes support for speakerphone,
dedicated keys for common telephony features and LED’s for status of commonly used functions.
Key Features
• Half-duplex speakerphone and microphone
• Fixed keys for one-touch access to redial, transfer, conference, hold, line, select, mute, speakerphone and
voicemail keys
• LED’s to indicate status of commonly used features
• 2 line x 24 character monochrome display
• Two menu select keys and two-way rocker for scrolling control
Specifications
Included Included Cisco 880 Up to 4
Included Included Cisco 1861 Up to 15
FL-SRST-25 FL-SRST-25= Cisco 2801 Up to 25 phones
FL-SRST-50 FL-SRST-50= Cisco 2821 Up to 50 phones
FL-SRST-100 FL-SRST-100= Cisco 2851 Up to 100 phones
FL-SRST-250 FL-SRST-250= Cisco 3845 Up to 250 phones
*** *** Cisco 3845 Up to 730 phones
FL-SRST-480 FL-SRST-480= Cisco Catalyst 6500
Communication Media
Module
Up to 336 phones**
Cisco Unified IP Phones 3900 Series
Feature Cisco Unified IP Phones 3900 Series
Integral Switch
No
Display
144x32 monochrome
Programmable (line) keys
0
Programmable (soft) keys
0
Speakerphone
Half-duplex
Headset port
No
Wideband audio
No
iLBC support
No
“5-way” navigation cluster
No
XML application
No
Extension mobility
No
Video Advantage Camera
support
No
Signaling protocol
SIP