Cisco 881 SRST Uživatelský manuál stáhnout pdf (Strana 13)

Feature Description

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.

Table 10. Cisco IOS Software Features on Cisco 880 Series with Cisco Unified Border Element: Advanced IP Services

Feature Set

Feature Description

Cisco Unified Border Element version Cisco Unified Border Element 7.0 and later are supported.

Call-control signaling H.323 Versions 1, 2, 3, and 4, MGCP 0.1 and 1.0, 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 that allow 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 PSTN trunk 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

Cisco 880 Cisco Unified Border Element supports the following VoIP trunk signaling protocols:

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Up to 15 SIP-to-SIP sessions. (no H.323 support)

Note: The Cisco 880 with Cisco Unified Border Element does not include DSP feature support such as

transcoding or transrating.

Note: The Cisco 880 with Cisco Unified Border Element does not support concurrent operation of

SRST or Cisco Unified Communications Manager Express.

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 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 PBX or

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.

System Specifications

Tables 11 and 12 list the system specifications for the Cisco 880 Series Routers.

Table 11. System Specifications

Feature Description

Default DRAM

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256 MB on Cisco 880 Series data models

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512 MB on Cisco 880 Series WLAN, embedded 3G wireless WAN (WWAN), Voice and

SRST/Cisco Unified Border Element models

Maximum DRAM

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768 MB on Cisco 880 Series data, voice and Cisco Unified Border Element models

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 22 23

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