Patent ID: 6707887
Filing Date: 2004-03-16
Classification: H04M

Abstract:
A method, comprising:using a controller to control loop-start detect circuitry to determine if a trunk interface is a loop-start trunk by closing a tip ring loop at said trunk interface; dialing a test number; determining if said trunk interface is a loop-start or ground-start interface depending on whether a dial tone is detected as going off; and determining if a network disconnection indication is provided by determining if an incomplete dial is received and the loop is disconnected; and if said trunk interface is not a loop-start trunk, using said controller to control ground-start detect circuitry to determine if said trunk interface has a correct polarity by connecting a ground to ring; determining if tip goes to ground; checking for dial tone; dialing a test number; determining if the ground-start connection has the correct polarity by detecting a dial tone disconnect; and determining if a network disconnection indication is provided by determining if an incomplete dial is received and the TIP is disconnected from ground.