LifeSize Gateway-PRI, Руководство пользователя

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140 LifeSize Gateway User Guide
About Dialing Out to the ISDN Network via the Gateway
A
BOUT
G
ATEWAY
S
ERVICE
P
REFIXES
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
About Gateway Services on
page 103 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.
12015294300—The destination phone number including the area
code.
The bit rate of the call is fixed according to the setting in the source IP network
terminal.
A
BOUT
S
ECOND
N
UMBER
D
ELIMITERS
Note
Second number delimiters are available in Gateway-PRI only.
To dial an outgoing 2B call, you dial the service prefix for 1B calls and the two
B channel phone numbers. Because some H.323 endpoints do not support
dialing long number strings or two phone numbers, you can use a delimiter to
indicate to the LifeSize Gateway the end of one number and the beginning of the
other. See
Configuring Outgoing Call Delimiters on page 72 for more
information.