All reset levels act upon SBS trunk calls in the same manner they act on other types of trunk calls. A reset level 2 or higher causes any SBS trunk call to be dropped. The signaling and bearer portions of the SBS trunk call are dropped and all facilities associated with the SBS trunk call re-initialized. All administered SBS extensions are placed in the available state (to call processing) after a level 2 or higher reset.

A hot restart or a warm restart (reset level 1) do not affect existing stable SBS calls.