Trunk Signaling

Trunk Signaling

Lines and trunks must adhere to signaling standards just as telephony networks and telephone companies do. Trunk signaling serves to initiate the connection between the switch and the network. There are five different types of trunk signaling, and each applies to different kinds of interfaces, such as FXS, FXO, and E&M:

• Loop-start signaling

• Ground-start signaling

• E&M wink-start signaling

• E&M immediate-start signaling

• E&M delay-start signaling

The following sections explain these signaling types