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VIP User's Manual
VIP enables the transmission of voice and fax traffic over any IP network by digitizing voice and fax
signals, encapsulating the information within IP packets, and then sending the packets across the
IP network
3.1
How VIP Operates
1.
The TIM inside VIP digitizes analog voice signals at 8 Kbps.
2.
VIP system software handles the:
Ÿ
Capture of telephone number presented as DTMF tones.
Ÿ
Mapping the telephone number to the IP address of remote VIP.
Ÿ
Setting up calls with remote VIPs utilizing SIP call control protocol.
Digitizing, compressing and encapsulating the voice into IP packets and transmission of the
Ÿ
IP packets onto the Ethernet LAN.
3.
A router attached to the LAN forwards the IP packets across the WAN, where they will be re-
ceived by another VIP at the remote.
4.
The process is reversed at the remote VIP.
3.2
ATPM
To allow you to easily dial a telephone or fax on the network, VIP maps a series of dialed digits to
the IP address of the remote VIP whose phone or fax you are calling. This mapping information is
contained in a database inside each VIP called the dial plan.
Based on the dial plan the Address Translation and Parsing Manager (ATPM) inside VIP translates
telephony numbers to IP addresses of remote VIPs. The ATPM collects telephone number dialed
by users, decides whether the dial string is part of the dial plan and, if it is, maps it a remote VIP.
When the call is set up to the destination, a substring of the original dial string will be sent along to
the remote VIP.
3.3
Destination
The destination is where a call is terminated. Typically, for inbound calls from IP network, VIP ter-
minals the call at one of the telephony ports. The destination for the call is the telephony port where
the call terminated. For calls initiated from telephony ports, VIP forward the call to a remote VIP via
IP network, and the remote VIP terminal the call. The destination of the call is the remote VIP.
VIP Concepts
Chapter 3 VIP Concepts
7
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