Polycom MGC Administrator Administrator's Manual page 428

Chapter 7 - Configuring the Gateway
7-20
represent the alias of the H.323 destination endpoint in E.164 format. The
number is sent to the gatekeeper A where the digits 83 identify the gateway
(step 2 in Figure 10-14). Gatekeeper A returns the IP address of the gateway
to the endpoint (step 3 in Figure 7-14). The call is then routed to the gateway
(step 4 in Figure 7-14) including the alias of the destination endpoint (201).
The gateway sends the alias 201 to gatekeeper B for address translation (step
5 in Figure 7-14). Gatekeeper B returns the IP address of the endpoint to the
gateway (step 6 in Figure 7-14). The gateway connects the H.323 endpoint to
the session (step 7 in Figure 7-14) using the call parameters defined in the
Session Profile 91.
In this method, all H.323 endpoints on the network can call any H.323
endpoint when two gatekeepers (one in each zone) are present. The H.323
endpoints must register with the gatekeepers using their numeric aliases
(E.164 format). This enables the gateway sessions over firewalls without
changing the organization network configuration or compromising its
security.
Table 7-3: IP-to-IP/ISDN Methods Summary
Address Book
Method The H.323 endpoint dials
the gateway prefix and the
ID (E.164 format) of the
entry in the Address Book.
The entry is translated to
the ISDN number or IP
address/Alias of the
endpoint.
Configuration The conversion table must
be defined in the gateway.
Enables speed dialing to
the ISDN endpoints.
Notes Only pre-configured
numbers can be used.
Profile
The H.323 endpoint dials the
profile (same as gateway prefix)
and the ISDN number or IP
address/Alias of the endpoint.
Each network service and
configuration requires its own
Profile.
No need to configure any of the
numbers prior to calling.
Endpoint details are transferred
to the gateway in the dialed
number.
Any ISDN number or Alias can
be dialed without special
configuration of the endpoint.