Release Notes

Release Notes for the Cisco 1700 Series Routers for Cisco IOS Release 12.2(8)YL

OL-2941-03

New and Changed Information

Software Based LZ Compression with Hardware Encryption

This feature enables the Cisco 1700 Series routers to support Layer 3 compression (through use of the

Lempel-Ziv, or LZ, standard) in software with hardware-based IPSec encryption. Previously, this

combination could not be supported.

Benefits

One benefit of this feature is that, through LZ compression, encrypted packets being transmitted are

decreased in size, resulting in reduced WAN bandwidth demands. This allows VPNs to be supported

more effectively in regions of the world that only utilize low-speed WAN links.

Additionally, by supporting LZ compression with hardware encryption, greater processing power is used

for the encryption process, thereby increasing performance. By combining LZ compression with

hardware encryption, customers can realize high performance VPNs with reduced bandwidth demands.

Voice Support on Digital T1/E1 Interfaces

Release 12.2(8)YL1 adds voice support to digital T1/E1 interfaces. All the voice functionality that has

been supported on analog interfaces (Release 12.2(4)YB) will now be supported on digital T1/E1

interfaces.

The features that are included in this voice support are the following:

• MGCP VoIP call admission control

• MGCP-based fax (T.38) and DTMF relay

• Interactive Voice Response (IVR), Version 2.0

• MGCP 1.0

• Hoot and Holler over IP

• Call admission control for H.323 VoIP gateways

• T.37 store and forward fax

• Session Initiation Protocol (SIP) for VoIP enhancements

• ISDN progress indicator support for SIP using 183 Session Progress

• SIP intra-gateway hairpinning

• SIP diversion header implementation for redirecting number

• SIP configurable PSTN cause code mapping

• SIP T.38 fax relay

• SIP call transfer using refer method

• SIP gateway support for bind command

• SIP gateway support for third party call control

• DTMF relay for SIP calls using named telephone events

• SIP gateway support of RSVP

• Cisco IOS Telephony Service Version 2.0, and Survivable Remote Site Telephony (SRSTelephony)

• VoFR, H.323 Version 2 support