I think you mean "ISD" channel. There are 3 of them ie (ISD-1, ISD-2, ISD-3). I'll leave it up to someone else to tell you what those channels are used for.Occasionally I hear activity in denver,many times a select group will switch the ?isp" channel?anyone know what the "isp" channel is?
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That would be a pretty far off assumption to make. The fact that you don't hear it being referenced until a task force is involved should be a major hint.I assume it's school channel?, or maybe Internet based dispatch radio to radio? Don't hear it much,but usually when task force is up