RMX 2000 Administrator's Guide Version 7.6.1 - Polycom

Polycom RMX 1500/2000/4000 Administrator’s Guide
Direct Dial-in to Endpoints or DMA VMR using Automatically Generated
Destination Numbers
ISDN/PSTN participants can call the destination endpoints without interaction with the
IVR of the gateway. This dialing method is enabled when the administrator configures the
Gateway Profile to automatically generate the dial string of the destination endpoint or
Meeting Room on the DMA by truncating the dial in string and replacing the truncated
digits by other digits that can be used as the destination number.
For a detailed description of the call flow when dialing the DMA using this method, see
"Calling a DMA Direct with Automatically Generated Destination Dial Strings” on page 18-21.
Calling an IP Endpoint via Gateway
If the call destination is an IP endpoint, the endpoints must be registered to the same
gatekeeper to which the RMX is registered. There should be a mapping between the dial-in
numbers in the range defined for the ISDN Network Service and also assigned to the
Gateway Profile and the IP endpoints, in such a way that the alias of each endpoint is the
number that will be appended to the ISDN prefix.
When the call arrives to the gateway, this prefix is truncated and replaced by digits that
correspond to the MCU prefix in the gatekeeper and the call is forwarded to the destination
endpoint.
Figure 19 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 RMX 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.
18-8 Polycom, Inc.