Patent ID: 8406414
Filing Date: 2013-03-26
Classification: H04M

Abstract:
1. A method for scheduling ringing signals for a plurality of subscriber lines, comprising: maintaining a schedule of ringing signals for the plurality of subscriber lines in a processor device; determining a plurality of ringing counts in the processor device, each specifying a number of subscriber lines ringing at a selected point in the schedule; receiving a ringing request for a particular subscriber line in the processor device; identifying a position in the schedule for the ringing request based on the ringing counts that does not exceed a maximum ringing limit in the processor device; scheduling the ringing request in the schedule in the processor device responsive to identifying the position; identifying an error condition in the processor device responsive to not identifying a position in the schedule that does not exceed the maximum ringing limit subject to a maximum start delay between when the ringing request is received and when the ringing signal for the particular subscriber line is scheduled to start; and generating a ringing signal using an interface circuit for the particular subscriber line in accordance with the schedule.