Data Sheet
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Unified WLAN management Unified access point features:
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Supported by wireless LAN controller and Cisco WCS
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Configurable local or central switching for HREAP mode
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Radio management through Cisco WCS
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Transparent roaming with Mobility Groups
Table 8. Cisco IOS Software Features on Cisco 880 SRST Series: Advanced IP Services Feature Set
Feature Description
Cisco SRST version SRST 7.0 and later are supported.
Call-control signaling H.323 Versions 1, 2, 3, and 4, Media Gateway Control Protocol (MGCP) 0.1 and 1.0,
Skinny Client Control Protocol (SCCP), and SIP call-control protocols are supported.
ITU standard voice codecs G.711, G.729, G.729a/b, G.723.1, G.726, and G.728, which are standards-based
compression technologies allowing transmission of voice across IP, are supported.
The G.711 standard employs 64-kbps pulse code modulation (PCM) using either mu-law
or a-law. Other codecs employ lower bit rates.
Cisco Unified Communications
Manager support
For SRST features for IP phones, refer to the SRST data sheet:
http://www.cisco.com/en/US/products/sw/voicesw/ps2169/products_data_sheets_list.htm
l.
Cisco Unified Communications Manager support for analog and digital ports come with
Releases 6.1(3) , 7.0(2) and 7.1(3).
Telephony interface
signaling support
Cisco 880 SRST supports the following signaling protocols:
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FXS loop-start and ground-start signaling
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FXO
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Inbound signaling (such as dual-tone multifrequency [DTMF] and multifrequency
support)
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BRI QSIG
Voice features
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Echo cancellation: This feature cancels echo on tail circuits up to 64 msec
(configurable tail length).
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Silence suppression and voice activity detection (VAD): Bandwidth is used only when
someone is speaking. During silent periods of a phone call, bandwidth is available for
data traffic.
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Comfort-noise generation: This feature reassures the phone user that the connection
is being maintained, even when no voice packets are being transmitted.
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Caller ID support: Per port caller ID (with per call unblocking) is configurable over
analog FXS.
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Dial-plan mapping: This feature simplifies configuration and management through
automatic mapping of dialed phone numbers to IP addresses.
Voice port–specific features
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FXS: FXS provides battery polarity reversal detection and initiation for disconnect
supervision and far-end answer supervision.
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ISDN BRI network side and phantom power: The BRI port provides the ability to
connect a private branch exchange (PBX) or private automatic branch exchange
(PABX) configured as user side directly to the router. It also provides phantom power
to accommodate equipment that requires it.
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LED indicators show voice-processing resources and port status.
Fax and modem
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Fax and modem pass-through allows fax and modem traffic to pass through a voice
port.
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Fax Relay provides a more robust protocol for fax transmission over packet
networks. It also supports the T.37 and T.38 fax protocols.
High-performance flexible digital-
signal-processor (DSP)
architecture
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Channel capacity: Cisco 880 SRST supports up to four voice channels.
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Flexible DSP architecture: There is no need to specify codec complexity at
configuration. An appropriate codec is dynamically selected when a call is
established, while allocating DSP resources optimally.
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Feature upgrades: The DSP architecture allows for addition of new features through
simple code updates.
