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Gateway Calls
Polycom®, Inc. 633
Call Flow from ISDN Endpoint to H.323 Endpoint with Automatically Generated Forwarded Dial String
For example:
● The ISDN prefix is 9251.
● The dial in number range defined in the ISDN Network Service can be 100 to 400 (that is, 9251100
to 9251400).
● The dial in numbers assigned to the Gateway Profile can the entire range, or part of the range of other
Gateway Profiles are to be used: 100 to 200 (that is 9251100 to 9251200).
● The aliases assigned to the IP endpoints will range between 100 to 200 or 400 (for the full range) as
well.
● MCU Prefix in the gatekeeper: 79.
● Number of digits to append (same as the ISDN prefix is this example): 3.
● The destination endpoint alias is 123.
● The ISDN endpoint dials 9251123. The Collaboration Server truncates the four first digits 9251
replacing them with 79 and appends 123 to 79, to create the destination number 79123 which is sent
to the gatekeeper for routing.
Interoperability with DMA
The Collaboration Server does not register to the gatekeeper as a Gateway, therefore it is recommended to
create and use the DMA Dialing Rules to enable the DMA Dial One Method.
When the caller enters the Dial One digit as the destination number prefix, the DMA replaces this digit with
the MCU prefix in the Gatekeeper and the ID of the Gateway Profile. For example, the calling participant
can enter 99251444, where 9 is the digit that is used as the MCU prefix registered in gatekeeper and is
replaced by the gatekeeper with * and the Gateway Profile ID (for example, *2000) as defined in the Dialing
Rule.
For more details on Dialing Rules definition in the DMA, see Dial Rule Operations in the Polycom
RealPresence DMA System Operations Guide.