Intercom question

Hi All:

Is there an actual requirement that a set of jacks be installed separate
from the intercom jacks that go directly to the radio?

I had thought this was needed so that in case of a catastrophic intercom
failure the radio would still be available.

This has been present in past planes that I have owned and flown. However I
just purchased a plane without any jacks going directly to the radio.

Before I ruin my back wiring a direct of jacks in place I ask Are direct
inputs to the radio required? If so what requires them?

Thanks

Paul
N1431A