Cisco 881 Datasheet page 12

Feature
Voice features
Voice port-specific features
Fax and modem
High-performance flexible digital-
signal-processor (DSP) architecture
Table 9.
Feature
Cisco SRST version
Call-control signaling
ITU standard voice codecs
Cisco Unified Communications
Manager support
Telephony interface signaling support
Voice features
Voice port-specific features
Fax and modem
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Description
● Echo cancellation: This feature cancels echo on tail circuits up to 64 msec (configurable tail length).
● 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.
● Comfort-noise generation: This feature reassures the phone user that the connection is being
maintained, even when no voice packets are being transmitted.
● Caller ID support: Per-port caller ID (with per-call unblocking) is configurable over analog FXS.
● Dial-plan mapping: This feature simplifies configuration and management through automatic
mapping of dialed phone numbers to IP addresses.
● FXS: FXS provides battery polarity reversal detection and initiation for disconnect supervision and
far-end answer supervision.
● 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.
● LED indicators show voice-processing resources and port status.
● Fax and modem pass-through allows fax and modem traffic to pass through a voice port.
● Fax Relay provides a more robust protocol for fax transmission over packet networks. It also
supports the T.37 and T.38 fax protocols.
● Channel capacity: Cisco 880 V supports up to four voice channels.
● 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.
● Feature upgrades: The DSP architecture allows for addition of new features through simple code
updates.
Cisco IOS Software Features on Cisco 880 SRST Series: Advanced IP Services Feature Set
Description
SRST 7.0 and later are supported.
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.
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.
For SRST features for IP phones, refer to the SRST data sheet at:
http://www.cisco.com/en/US/products/sw/voicesw/ps2169/products_data_sheets_list.html.
Cisco Unified Communications Manager support for analog and digital ports comes with Releases
6.1(3), 7.0(2), and 7.1(3).
Cisco 880 SRST supports the following signaling protocols:
● FXS loop-start and ground-start signaling
● FXO
● Inbound signaling (such as dual-tone multifrequency [DTMF] and multifrequency support)
● BRI QSIG
● Echo cancellation: This feature cancels echo on tail circuits up to 64 msec (configurable tail length).
● 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.
● Comfort-noise generation: This feature reassures the phone user that the connection is being
maintained, even when no voice packets are being transmitted.
● Caller ID support: Per-port caller ID (with per-call unblocking) is configurable over analog FXS.
● Dial-plan mapping: This feature simplifies configuration and management through automatic
mapping of dialed phone numbers to IP addresses.
● FXS: FXS provides battery polarity reversal detection and initiation for disconnect supervision and
far-end answer supervision.
● 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.
● LED indicators show voice-processing resources and port status.
● Fax and modem pass-through allows fax and modem traffic to pass through a voice port.
● Fax Relay provides a more robust protocol for fax transmission over packet networks. It also
supports the T.37 and T.38 fax protocols.
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