Polycom 7.5 Manual De Usuario

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Chapter 4 - Setting Up Conferences
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Advanced Dial-In
In advanced dial-in, one IP Network Service is defined for all the IP cards 
installed in the system. This IP Network Service is registered in the 
gatekeeper using a prefix (which is defined in the E.164 format, that is, using 
digits 0-9, * and #). This IP Network Service Prefix is also entered in the IP 
Network Service Properties - H.323 dialog box and is given to the participants 
as the dial-in number.
Figure 4-7:  Advanced Dial-in H.323 Participant
When the participants dial in, the call arrives at the gatekeeper. The 
gatekeeper locates the MCU and tries to allocate a port from the first free IP 
card. If the resource is available, the participant is connected and routed to the 
appropriate conference according to the IP address/alias as defined in the 
Participant Properties dialog box. If the resource is unavailable from the first 
IP card, the system will look for the port on any available IP cards, and 
allocate the resources automatically, according to their availability. If no port 
is available, the connection will be rejected.
In this mode, the system is enabled to automatically allocate resources to run 
conferences, saving you time and effort in scheduling conferences.
Endpoint IP: 
196.123.38.129
Alias: 259
Endpoint IP: 
196.123.38.146
Alias: 256
Endpoint 
dials 45
Dials 148
Gatekeeper
Network 
Service 
Prefix=45
Endpoint IP: 
172.123.12.89
Alias: 268
MCU
LAN
Endpoint 
dials 45
Conference1
IP card A
Conference2
IP card B
Conference1
Participant 1 alias: 256
Participant 2 alias: 259
Participant 3 alias: 378
Conference2
Participant 1 alias: 268
Participant 2 alias: 281
Participant 3 alias: 224