in its registration database, sees ccdp registered, and returns the appropriate IP address to
get to ccdp.
gatekeeper does.
type prefixes, also called technology prefixes. The zone prefixes, which are typically area
codes, serve the same purpose as domain names in H.323 ID address routing. Unlike
domain names, however, more than one zone prefix can be assigned to one gatekeeper, but
the same prefix cannot be shared by more than one gatekeeper. With Cisco IOS release
12.0(3)T and later, interzone routing can be configured using E.164 addresses.
it is with H.323 IDs. Again, the source endpoint's gatekeeper finds the gatekeeper for the
specified domain and sends the location request for the target address to that gatekeeper.
VoIP solutions. Cisco CallManager is a client/server application that resides on a Windows NT
server and performs all the functionality that normally resides on a traditional PBX. Think of
Call Manager as a new and improved PBX for IP. Call Manager can support up to 5000 phones
on a single server, and it relates well to H.323-compliant gateways. Cisco CallManager is the
software-based call-processing component of the Cisco IP telephony solution, part of Cisco
AVVID (Architecture for Voice, Video, and Integrated Data). The software extends enterprise
telephony features and functions to packet telephony network devices such as IP phones, media
processing devices, VoIP gateways, and multimedia applications. Additional data, voice, and
video services such as unified messaging, multimedia conferencing, collaborative contact
centers, and interactive multimedia response systems interact with the IP telephony solution
through Cisco CallManager's open telephony application programming interface (API).
CallManager software product includes a suite of integrated voice applications that perform
voice conferencing, manual attendant, bulk administration, and simple billing and quality
monitoring functions. Supplementary and enhanced services such as hold, transfer, forward,
conference, multiple-line appearances, automatic route selection, speed dial, last-number
redial, and other features are extended to IP phones and gateways. Because it is a software
application, enhancing its capabilities in production environments is a matter of upgrading
software on the server platform, thereby avoiding expensive hardware upgrade costs.