Polycom MGC Administrator, Administrator'S Manual

Page: 423 / 584

MGC Administrator’s Guide
7-15
Figure 7-9: IP-to-ISDN Call Flow Using Address Book
The gateway uses 41 to identify the Session Profile to be used for calling the
ISDN endpoint. It determines the call line rate, restricted and transcoding
settings. The gateway identifies #30 as an entry in the Address Book table and
translates this entry to 8254050 (step 5 in Figure 7-9). The gateway calls the
number 8254050 using the parameters defined in the Session Profile
identified by the digits 41and connects both endpoints (step 6 in Figure 7-9).
Using this method, a gatekeeper must be present for address translation of the
prefix and Session Profile to the gateway IP address.