Endpoint Over An H.323 Backbone To H.320 Endpoint, Using Profile - Polycom MGC Administrator Administrator's Manual

Step 2. The local gateway automatically dials the remote gateway using the
string 9042. The digits 90 represent the remote gateway (H.323)
prefix taken from the local Gateway Link. The Remote Gateway
H.323 profile ID, 42, represents the configured Session Profile (ID
E.164) parameter defined in the To H.323 Session Profile Definition
dialog box. The remote gateway sends a TCS4 request to local
gateway. The local gateway translates the E.164 string into TCS4 and
sends it to the remote gateway. The remote gateway translates the
TCS4 message into the E.164 alias and connects the call to the
remote endpoint. 222 is the Alias retrieved from the dial string and
represents the destination endpoint.
Step 3. The remote gateway dials 222 and connects the call.
H.320 Endpoint Over an H.323 Backbone to H.320 Endpoint,
Using Profile
The H.320 endpoint connects using the following string: [Dial-in No., Link
DID]^[ISDN No.], for example, 43218071^222.
Figure 7-26: ISDN-to-ISDN Over H.323 Backbone Call Flow Using Profile
Step 1. The H.320 endpoint dials the MCU/gateway prefix, Link DID and
ISDN number.
The digits 4321 represent the Dial-in number defined in the Network
Service Properties, 8071 is the Gateway Link DID taken from the
MGC Administrator's Guide
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