Datasheet

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Feature
Description
Voice port-specific features
●
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
●
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.
High-performance flexible
digital-signal-processor
(DSP) architecture
●
Channel capacity: Cisco 880 SRST 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 DSP resources are allocated optimally.
●
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:
●
FXS loop-start and ground-start signaling
●
FXO
●
Inbound signaling (such as dual-tone multifrequency [DTMF] and multifrequency support)
●
BRI QSIG
Cisco 880 Cisco Unified Border Element supports the following VoIP trunk signaling protocols:
●
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
●
Echo cancellation: This feature cancels echo on tail circuits up to 64 msec (configurable tail length).
●
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.
●
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.
Voice port-specific features
●
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 PBX or 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.