When you want to emulate an RTS BP-325, or if you want call signal to actuate on the RS-703 BP on both channels (in Clear-Com mode, the BP will only receive a call on the B channel). Remember that this mode can only be used when attaching the RS-703 BP to an RTS system or a Clear-Com device that can emulate RTS mode, such as HelixNEt, LQ, FreeSpeak II Base, and some others, but not native to the ENCORE product line.
Instructions
Loosen the set screw on the back of the Belt Pack (BP)
In early models, the screw is a #1 Phillips Head and in recent ones, a #8 TORX Head
Slide the metal clip 90 degrees to expose the dip switched
With a small screwdriver or a metal pick, slide switched 5, 8 and 9 to the down position
Return the metal clip to the normal position and tighten the screw
...