The use of 911 equipment initiates with a call via landline or cellular, and what other method?

The correct answer is the use of Voice over Internet Protocol (VoIP), which allows users to make phone calls using the internet instead of traditional landline or cellular networks. VoIP has become an increasingly popular method for placing calls, including to emergency services like 911. Many people utilize this technology for its cost-effectiveness and convenience, especially when using devices such as computers or smart devices that support network-based calling.

While text messaging is a way to communicate with emergency services in some jurisdictions, it's less common and not universally supported compared to voice calls. Satellite phones, although capable of making calls to emergency services, are generally limited to areas without cellular coverage and are not a standard method for all users. Pagers are typically obsolete for modern emergency communication, as they mainly serve specific use cases and do not function as a direct means to call 911.

In summary, VoIP is a significant method for initiating emergency calls alongside traditional landline and cellular technologies, offering a versatile option that aligns with current communication trends.