Cisco uBR924 Specifications download pdf (Page 16)

Release Notes for Cisco uBR924 Cable Access Router for Cisco IOS Release 12.1(5)T

OL-0385-04 Rev. B0 (2/2001)

New and Changed Information

Ecosystem Gatekeeper Interoperability Enhancements

The Ecosystem Gatekeeper Interoperability Enhancements feature improves the ability of voice

gateways to move between gatekeepers upon a failure or an outage. Currently, gateways can be

configured to switch from their primary gatekeeper to an alternate gatekeeper if a failure or outage

occurs.

However, moving gateways from one gatekeeper to another can create an imbalance in the number of

gateways registered to each gatekeeper. The Ecosystem Gatekeeper Interoperability Enhancements

feature helps to restore the balance by moving some of the gateways back to their proper gatekeepers

after the outage has been corrected.

This feature adds support for the alternate gatekeeper field (altGKInfo) to the gatekeeper rejection and

registration rejection messages. This allows a gateway to move between gatekeepers during the

gatekeeper request and registration request phases.

This feature is introduced in Cisco IOS Release 12.1(1)T.

Note For more information on this feature, see the Ecosystem Gatekeeper Interoperability

Enhancements feature module, available on CCO and the Documentation CD-ROM.

H.323 Enhancements

Cisco IOS Release 12.1(1)T adds a number of H.323v2 features for voice support:

• Fast Connect—This H.323v2 feature allows connections for the most common types of calls to be

created without establishing a separate H.245 control channel.

• H.245 Tunneling—Supports two H.245 features during a call without having to establish an H.245

channel:

–

DTMF digit relay—Dual-tone multifrequency (DTMF) tones are often used during a voice call

to convey information, such as entering an account number voice-mail commands. Certain

forms of compression (such as G.729 and G.723.1) might interfere with these tones, so they

must be transmitted “out of band,” separated from the encoded voice stream.

–

Hookflash relay—Many types of PBX and telephone switches give a special meaning to a

hookflash (quickly depressing and releasing the hook on your telephone). Because this creates

a voltage change that cannot be transmitted across an IP network, the H.323 protocol can send

an H.245 User Input Indication message to convey the hookflash to the remote end.

This feature is introduced in Cisco IOS Release 12.0(7)XR and Release 12.1(1)T.

Note For information about these features, see H.323 Version 2 Support, available on CCO at

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t5.

Secure Shell Server Support

The Cisco uBR924 router supports the Secure Shell (SSH) Version 1 protocol, which allows network

administrators to make a secure Telnet connection with the router. SSH provides for authentication and

encryption at the application layer, providing a secure connection even when BPI or IPSec

authentication and encryption are not used at the network layer.

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Cisco uBR924 Specifications Page 16