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If you have an IP change on your Internet connection for whatever reason, drop outs, or your broadband fails and you failed-over to your 4G or 5G backup, Asterisk (the underlying engine for FreePBX) still uses your previous IP, and because of that, calls fail, inbound recovers, but not so with outbound.
Playing music on hold (MoH) on your phone system whilst your caller is waiting to connect to the person or department they are after, or whilst someone ducks off to get some information, is a given these days, no-one wants to sit there and listen to silence, or nothing but the sound of keyboard tapping for 5 minutes.
As everyone who owns a UPS knows, SLA batteries, a type of Lead Acid chemistry that's commonly used in UPS's, usually fail after two or so years (the hot and humid Queensland climate helps with this quick demise), often without warning, requiring you to yet again fork out more cash to buy brand new batteries.