Ringdale ISDN - Manual (Page 48)

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Call Setup Tab
General Call Setup
General Call Setup appears under the Setup Tab > Call Setup Tab
for the properties for a router.
Maximum Call Attempts: Type a number representing the
maximum number of calls the selected router should make to the
remote device when trying to establish a link. For reasons such as
call collisions (when both devices try to call each other
simultaneously), some devices may not pick up on an initial call
but may pick up on a subsequent call.
CONFIGURING YOUR ROUTER