Telephone Call Answering Service: How It Works and How to Set One Up

A telephone call answering service handles incoming calls on behalf of a business. Instead of a call ringing out or going to voicemail, it is answered by the service, which follows instructions you provide: your business name, hours, services, prices you want shared, and how to handle bookings.

Most owners answer their own phone, so an answering service is not a replacement for staff. It covers the times you cannot pick up: after hours, while on a job, or during a rush of calls. When a caller asks something the service does not know, such as a price or an answer not in your saved business information, it takes a message instead of guessing.

• Answers calls on your existing number using your saved business details
• Takes messages with caller name, number, and reason for calling
• Can book new appointments once you have set up your services and availability
• Shows calls, transcripts, summaries, and bookings in a dashboard so you can review everything
• Forwards a call to you when your rules say to, such as for an existing appointment change request

Understanding the path of a call helps you see what you are signing up for. The flow below describes how AllDayDesk, the answering service on this site, handles a typical call.

• Step 1: A caller dials your normal business number. Nothing changes for them.
• Step 2: Your phone service forwards the call to AllDayDesk based on the forwarding you set up with your carrier.
• Step 3: The service answers using your business information, greets the caller, and finds out why they called.
• Step 4: For a new appointment, it uses the AllDayDesk dashboard calendar, which works once you have configured your services and availability. An optional Google Calendar connection can be added in Settings after you connect and authorize your Google account.
• Step 5: For questions it cannot answer, like a price not on file, it takes a message. Changes to existing appointments are passed to you as requests, not confirmed changes.
• Step 6: If your rules call for it, the service can transfer a call to a destination you configured. Pickup is not guaranteed, so treat transfers as one tool among several.
• Step 7: You review the call, transcript, summary, and any booking in your dashboard.

Not all answering services work the same way. Knowing the main types helps you match a service to your budget and call volume. The comparison below covers documented features of each category, not hands-on testing.

• Human answering services: trained people answer your calls. AnswerConnect, for example, offers 24/7 live business answering by people. Human virtual receptionist plans vary widely; Ruby advertises plans starting at $245 per month as of October 2026, and Smith.ai uses per-call pricing for its human receptionist service. Always compare included minutes or calls, overage charges, hours, and contract terms on a current quote.
• AI answering services: software answers using your saved business information. AllDayDesk is this site's own AI answering service. It answers around the clock, takes messages, books appointments in its dashboard calendar, and shows transcripts and summaries. Around-the-clock availability describes when the service is available, not a guarantee that every call connects.
• Hybrid services: some providers combine AI with human agents. Smith.ai, for instance, offers a separate AI receptionist product with on-demand escalation to its live agent network. That is their feature, not AllDayDesk's.
• In-house reception: an employee at your front desk answers calls along with greeting visitors and other office tasks. The US Bureau of Labor Statistics describes receptionist duties that go well beyond phone answering, so compare scope rather than treating a phone service as a full employee replacement.

Before signing up, work through these decision points. They apply whether you pick AllDayDesk or another provider.

• Coverage needs: decide whether you want after-hours coverage, all-day coverage, or only overflow during busy periods.
• Booking needs: if you want callers to book appointments, check that you can define your services and availability, and whether your calendar tool is supported. AllDayDesk uses its built-in dashboard calendar by default, with an optional Google Calendar connection in Settings after you authorize your account.
• Message handling: confirm what happens when the service cannot answer a question. It should take a message rather than guess at prices or policies.
• Transfers: if you want some calls passed to you, check how destinations and rules are configured, and understand that neither pickup nor an immediate response is guaranteed.
• Visibility: look for a dashboard where you can read calls, transcripts, summaries, and bookings.
• Cost structure: compare included minutes, per-minute overage rates, and what happens when you exceed your allowance. AllDayDesk pricing is displayed separately on this site.
• Setup effort: you will need to provide your business details and set up call forwarding with your carrier, so pick a service whose setup steps you can complete.

You keep your public phone number when you use an answering service. The connection happens through call forwarding, and the instructions depend on who provides your phone service. Check your exact product name first, because the same carrier often uses different steps for wireless, landline, and business VoIP products.

Some verified examples: Verizon mobile uses *72 plus the 10-digit destination for all-call forwarding, *71 for unanswered calls, and *73 to disable. T-Mobile uses **21*1, destination, # for unconditional forwarding and **61*1 for no-reply forwarding. Comcast Business phone features such as forwarding are managed in My Account and the Comcast Business App, and available features depend on the services you subscribe to. Vonage Business Communications lets you select Call Forwarding and forward calls to a phone number. Frontier, Optimum, AT&T, Spectrum, Windstream, Astound, C Spire, Cricket, and Tracfone all have their own product-specific steps, which we document on the carrier pages linked below.

Two important limits: Google Voice does not support forwarding calls from a Google Voice number to an automated system, so a Google Voice line is not a compatible path to AllDayDesk. And if your carrier does not offer conditional forwarding (busy or no-answer only), you can use unconditional all-call forwarding during the hours you want covered instead, then disable it when you want calls ringing at your own line again.

• Identify your exact phone product from your bill before using any forwarding instructions
• Wireless, landline, and business VoIP products from the same carrier often use different codes or portals
• Verify forwarding works by having someone call your business number from an outside phone
• Disable forwarding with the matching off code or portal control when you want calls back at your line

We maintain step-by-step forwarding guides for the major US carriers and phone products. Each guide identifies the exact product it covers, because codes and portals differ between a carrier's wireless, landline, and business VoIP offerings.

• Verizon wireless and Verizon business landline forwarding
• T-Mobile conditional and unconditional forwarding codes
• AT&T Phone for Business and AT&T Collaborate codes
• Comcast Business Voice Mobility and Managed Voice
• Spectrum Business Voice portal steps
• Frontier Digital Voice, Optimum, Vonage, Windstream, and Astound