Recurring Maintenance And Services

I am curious how security integrators calculate and charge for annual service and support for the initial system installation and its hardware? Do you use a flat percentage based on the sale price of the project? Do you get granular and calculate the price for annual maintenance based on the number of cameras, door controllers, servers, other? Do you offer incentives for day-1 purchase of a maintenance agreement, or a multi-year agreement? Thanks.

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