Polycom RMX 1500 Administrator's Manual page 600

Chapter 17-Gateway Calls
17-10
Dialing from ISDN/PSTN Endpoints
Figure 17-4Dialing String and Call Flow from ISDN Endpoint to IP Endpoint
[GW Profile ISDN/PSTN number] - the dial-in number assigned to
the Gateway Profile, including the required country and area codes.
For example, if the dial-in number assigned to the Gateway Profile is
5705555, enter this number with the appropriate area code: 2125705555.
Once the participant is connected to the Gateway Profile and hears the IVR
message requesting the destination number, using the DTMF input
keypad, the participant enters the number of the destination endpoint
followed by the # key. For example, enter 3456# for IP endpoint.
To enter an IP address as the destination number, replace the periods (.)
with asterisks (*) in the format n*n*n*n followed by the # key. For
example, if the IP address is 172.22.188.22, enter 172*22*188*22#.
PSTN Dial-in Using GK Prefix
When connecting to an RMX that is standalone or part of a DMA solution
deployment, PSTN participants are prompted by an IVR message
requesting the Destination Conference ID followed by the # key to be
entered using the DTMF input keypad.
Including the Gatekeeper Prefix in the DTMF input string enables PSTN
participants to use the input string when connecting to an RMX whether
the RMX is a standalone MCU or part of a DMA solution deployment. For
a detailed description, see "PSTN Dial-in Using GK Prefix" on page 17-10.