The last few years have seen a huge rise in the use of automated voicemails and auto-attendant greetings. This has been especially true for the business sector, where professionals should record friendly and polite voicemails to greet their customer callers.
In practice, most businesses are simply handling this on a case-by-case basis since COVID is a temporary problem. Most home networks can handle the extra load as long as the employee makes sure that other latency-sensitive traffic, like gaming or video streaming, is kept to a minimum during the hours when they need to talk. If some home routers develop problems, IT staff simply build a queue and handle those one at a time. Sometimes they'll be able to access the router remotely with the employee's permission, sometimes they'll have to walk that employee through configuration steps to fix the problem. Sometimes the employee will just have to live with it unless the company springs for a new router or a higher bandwidth tier from the employee's ISP.

Voice over Internet Protocol (VoIP) phone systems allow users to make voice calls over the Internet. It converts callers' voices to digital signals that travel over the internet, allowing people to make calls from their computers.
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