C H A P T E R
4-1
Administrator’s Guide for Cisco IPVC 3521 BRI Gateway, Cisco IPVC 3526 PRI Gateway, and Cisco IPVC 3540 PRI Gateway
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4
Using the Cisco IPVC 3500 Series Gateway
This chapter describes the following topics:
•
About Dialing Out to the ISDN Network Through the Gateway, page 4-1
•
About Dialing from the ISDN Network to the IP Network, page 4-3
About
Dialing Out to the ISDN Network Through the Gateway
When you dial out from an IP network to an ISDN network, you dial a service prefix followed by a string
that usually includes the destination area code, the destination phone number and any required extra
characters such as an asterisk (*), pound sign (#), or delimiter. The service prefix indicates that the call
is to go through the gateway, and also indicates the properties of the call such as the call type, or
bandwidth requirements.
About Gateway Services
Cisco IPVC 3500 Series Gateway services define different call types and bandwidths for IP network
endpoints. The services are identified by service prefixes. The network administrator in charge of the
H.323 network is responsible for defining services and informing users of available services. See the
“About Gateway Services” section on page 3-34
for more information.
Note
A service prefix should not be the same as the first digits of an IP endpoint phone number.
Dialing Example 1: voice calls
The number string 912015294300 is a voice call from an IP network terminal to an H.323 endpoint on
another IP network or to a terminal on the ISDN network. This number string consists of:
•
9—The service prefix for a voice call.
•
12015294300—The destination phone number including the area code.
Dialing Example 2: Voice calls with the auto bit-rate setting service
The number string 712015294300 is a voice call from an IP network terminal to an H.323 endpoint on
another IP network or to a terminal on the ISDN network using a service with the bit rate setting of auto.
This number string consists of:
•
7—The auto bit-rate setting service prefix for a voice call.
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