The necessity of a gate bell in my working life stems from the combination of a fenced yard and a home office located well in the back of the property. The lack of such capability at the front gate makes receiving deliveries chancy, often requiring a lengthy drive to a UPS or Fedex facility to pickup a missed delivery.
In researching our initial attempt to remedy the lack of a gate alert I learned about SIP door phones from several companies. These devices were targeted at very large homes or office and apartment buildings, and tended to be very costly. Most were well over $1,000, which was dramatically beyond my budget.
However, Algo Communications offers a SIP door phone for a single family dwelling with a list price around $500. At the time I had thought that something analog, for around $250, was a better option. While that choice kept me on budget, it was ultimately disappointing, most especially when the device failed outright.