RMX 2000 Administrator's Guide - Polycom Support

Chapter 15-Gateway Calls
Dialing to Polycom® DMA 7000
15-24
Audio PSTN/ISDN calls can be routed to Polycom DMA 7000 via the
RMX. ISDN Video endpoints connect using their audio channels (but
consume video resources). The DMA 7000 enables load balancing and the
distribution of multipoint calls on up to 10 Polycom RMX media servers.
As part of this solution, the RMX acts as a gateway for the DMA that
supports H.323 calls. The PSTN or ISDN endpoint dials the virtual
Meeting Room on the DMA via the Gateway Profile on the RMX.
Both the RMX and the DMA must be registered with the same gatekeeper.
The dialing string of the destination conference on the DMA must be
communicated to the dialing endpoint and used during the connection to
the Gateway Profile on the RMX.
Figure 15-5Dialing String and Call Flow from ISDN Endpoint to Polycom DMA
The connection is done in two steps:
• A PSTN/ISDN participant dials the dial-in number assigned to the
Gateway Profile (5705555), including the country and area code (if
needed) and connects to the Gateway IVR.
• When prompted for the target conference ID, the caller enters the
string of the target meeting room on the DMA followed by the # key.
This string is composed of the DMA prefix as registered in the
gatekeeper and the ID of the virtual meeting room running on the
DMA. For example, if the DMA prefix is 25 and the target meeting
room ID is 8000 the participant enters 258000 followed by the # key.
The RMX creates a Gateway Session with two participants, the calling
participant and the link to the conference running on the DMA.