Adaptive fax timers which adjust current time value based on predicted response time

摘要

Timers involved in facsimile transmissions under the T.30 specification are permitted to adapt to a given situation to improve the chances for successful facsimile transmission over high latency communication networks. The specified T1 through T5 timers for facsimile transmission may be modified in value based on call control related parameters or facsimile transport related parameters. The timers may be set to have a particular range, with a nominal base value and a maximum value, which may exceed the T.30 timer specification. The adaptive timers can be modified based on a number of different criteria related to facsimile transmissions to avoid overlapping command-response situations and stalemates that may result from communications in relatively highly latency networks. The timers may also be adapted to minimize or optimize call length while achieving successful facsimile transmissions.

主权项

1. A facsimile device for processing a facsimile call, comprising:
a memory storage for storing a current timer value used in the facsimile call; a timer controller communicatively coupled to the memory storage and being responsive to at least one input related to operation of the facsimile device to generate and store the current timer value in the memory storage, wherein the timer controller is operative to predict, based at least on the at least one input, a response time for a facsimile endpoint device participating in the facsimile call, and to adjust the current timer value based on the predicted response time; and a processing engine communicatively coupled to the memory storage and being operative to access and apply the adjusted current timer value in processing the facsimile call.