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Appendix A: Getting Acquainted with Tenor CMS in the VoIP Network
How does CMS fit in the VoIP Network?
VoIP (Voice over Internet Protocol) is a technology which enables voice and fax communications to be passed
through your existing data network using the TCP/IP protocol, bypassing the PSTN. The Tenor CMS switch
contains a DSP (Digital Signal Processor), which takes the voice and fax data coming from a Line Circuit,
compresses it, and converts it into packets that can be transported over the Ethernet LAN. The data can then be
transported through an IP-based router to a WAN or remote location. As a result, your voice and fax traffic
runs over your data network to bypass the PSTN and avoid long distance tolls associated with the public net-
work.
The Tenor CMS uses H.323, a protocol standard for sending multimedia communications (e.g., data/voice/
video) simultaneously over packet-based networks, such as IP. H.323 controls standards such as call control
and call routing. An H.323 network consists of a group of endpoints (i.e., gateways, terminals, etc.) in one cor-
porate site, controlled by one Gatekeeper. The Tenor CMS acts as an endpoint (gateway), gatekeeper and/or
border element. The gateway converts the circuit switched calls to VoIP calls and the gatekeeper performs IP
call routing functions, such as admission control.
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P/N 480-0005-00-15
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