Cisco CISCO881GW-GN-A-K9 Datasheet download pdf (Page 12)

Feature Description

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 V 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.

Table 9. 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 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).

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