We are trying to use a single POTS line that is shared between a fax and an FXO port on a 2811 router. There is a line sharing device between the fax and the FXO that disconnects the fax and gives priority to the FXO when someone dials out. The issue is that the device takes about 3 seconds to disconnect, reset the line and then offer dialtone to the FXO port. By that time the port has gone off-hook, found no voltage or dialtone, and then goes back on hook all within 1 second and returns a fast busy to the caller. Is there any timing adjustments that can be made on the voice-port to allow the FXO to "wait" 3 to 4 seconds for dialtone before bailing out? I can't find anything that addresses this timeout setting.