User guide

18 Release Notes for Cisco 2500 Series for Cisco IOS Release 12.0 T
New and Changed Information
Using VC bundles, you can create differentiated service by flexibly distributing IP precedence levels
over the different VC bundle members. You can map a single precedence level or a range of levels
to each discrete VC in the bundle thereby enabling individual VCs in the bundle to carry packets
marked with different precedence levels. You can use WRED to further differentiate service across
traffic that has different IP precedence but that uses the same VC in a bundle.
ISDN BRI Voice over IP for Cisco 2600 and 3600 Series Routers
The Voice over IP feature enables the Cisco 3600 and Cisco 2600 series of modular routers to carry
voice traffic simultaneously with data traffic over an IP network. Voice over IP (VoIP) is primarily a
software feature, supporting both voice and fax calls. Support for the ISDN BRI signaling type
allows a Cisco 3600 or Cisco 2600 series router to provide voice access connectivity to either an
ISDN telephone network or to a digital interface on a PBX/key communications system. The voice
or data also crosses an IP network to which the router connects. This allows branch offices and
enterprises to route incoming public switched telephone network (PSTN) ISDN BRI calls over an
IP network or send outgoing digital fax and voice calls via an IP network.
Large Scale Dialout
Large scale dialout eliminates the need to configure dialer maps on every network access server
(NAS) for every destination. Instead, you create remote site profiles containing outgoing call
attributes (telephone number, service type, maximum number of links, and so on) on an
authentication, authorization, and accounting (AAA) server. The profile is downloaded by the NAS
when packet traffic requires a call to be placed to a remote site. Large scale dialout also takes
advantage of features previously only available for incoming calls, such as dialer and virtual profiles,
Multichassis Multilink PPP (MMP) support, and the ability to use an AAA server to store dial out
attributes. MMP allows NASes to be stacked together and appear as a single NAS chassis so that if
one NAS fails, another NAS in the stack can accept calls. Additionally, large scale dialout addresses
congestion management by seeking an uncongested, alternative NAS when the designated primary
NAS experiences port congestion.
Multilink Inverse Multiplexer
The Multilink Point to Point Protocol (MLP) Inverse Multiplexer feature allows you to combine
multiple T1/E1 lines in a Versatile Interface Processor (VIP) T1/E1 interface into a bundle that has
the combined bandwidth of the multiple T1/E1 lines. This is done by using a VIP MLP link. You
choose the number of bundles and the number of T1/E1 lines in each bundle. This allows you to
increase the bandwidth of you network links beyond that of a single T1/E1 line without having to
purchase a T3 line.
Multimedia Conference Manager
Use the Multimedia Conference Manager to enable your current internetwork to route bit-intensive
data such as audio telephony, video and audio telephony, and data conferencing using existing
telephone and ISDN links, without degrading the network’s current level of service. The Multimedia
Conference Manager feature provides H.323 application options previously unavailable. Using
Multimedia Conference Manager, you can implement H.323-compliant applications on existing
networks in an incremental fashion without upgrades. This feature also provides a rich list of
networking capability, including:
• A means to implement Quality of Service (QoS), which is required for the successful deployment
of H.323 applications.