LifeSize Gateway-PRI, User Manual

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142 LifeSize Gateway User Guide
About Dialing In to the IP Network via the Gateway
Figure 4-1 TCS4 Dialing
This number string consists of:
9—The voice call service prefix in Gateway A in Zone A.
82—The service prefix for a 2B video call in Gateway A in Zone A.
5645000—The number of the destination Gateway B on the public
ISDN network.
^—The TCS4 delimiter configured in Gateway A.
3333—The E.164 number of the destination IP Endpoint 2.
A
BOUT
D
IALING
I
N
TO THE
IP
N
ETWORK VIA THE
G
ATEWAY
The LifeSize Gateway is responsible for routing incoming calls to the requested
H.323 endpoints on the IP network.
When a terminal or phone on the ISDN network wants to reach an IP endpoint,
it has to dial at least one of the phone numbers assigned to the ISDN line
connected to the LifeSize Gateway PRI ISDN port.
A
BOUT
I
NCOMING
C
ALL
R
OUTING
When a call originating on the ISDN or serial network reaches the LifeSize
Gateway, the LifeSize Gateway routes it to an IP network endpoint. This is
achieved through one of several incoming call routing methods that the LifeSize
Gateway supports. You can enable any number of routing methods for each
port, but at least one method must be enabled for incoming calls to be routed
through that port. The LifeSize Gateway routes an incoming call from the ISDN
or serial network according to the routing methods enabled for the ISDN or
serial port, following this order of priority: DID
−>
TCS4
−>
IVR
−>
Default
Extension.
If a routing method fails, the LifeSize Gateway automatically tries to route the
call through the next routing method in line. If all methods fail, the call is
rejected. The call might also be rejected if the LifeSize Gateway routes the call
to an endpoint that is busy or not available.
Table 4-1 explains the routing methods.
Public
ISDN
IP
Gateway A
Gateway B
5645000
IP
Endpoint 1
Endpoint 2
3333