Options for acoustic loop. Intercom firefighters POMP V2F

Intercom firefighters to call cabin/machinery (Standard 81-72). For surface embedded in thin wall. Voice communication priority - level firefighters cabin (additional contact for machinery). Is connected by two son at MACH V2. Provide a 12V-type BAS 1210. Stainless steel front 2 mm (dimensions: 250 x 80 mm - depth 40 mm). Former reference: POMP-V2F