What are concurrent calls?
- Concurrent calls
- Concurrent calls are calls in progress at the same moment on the same business line, and the number a business can handle at once is capped by its phone line's channels, not by who or what answers them.
What concurrent calls means in practice
A person holds one conversation. A staffed answering service holds as many as it has agents free, and a queue forms past that.
Software holds as many as arrive, which is the clearest structural advantage an AI receptionist has.
It matters most on your busiest days, which is exactly when a human front desk is already on a call and the second caller hears a ring-out.
What people get wrong
Counting the overlap in a Monday morning
Say a pediatric office opens its phones at 8:00 on a Monday. The log shows calls starting at 8:00, 8:01, 8:01, 8:02, 8:04 and 8:06, each lasting about three minutes. Draw them as bars on a timeline and count how many overlap. At 8:01 there are three in progress. By 8:02 a fourth has started before the first has ended, so it's four. With two phone lines, two of those parents heard a busy signal.
Phone engineers have a century-old formula for this, called Erlang B. Feed it your busy-hour load and it tells you what share of callers get blocked for a given number of lines. If an office receives 20 three-minute calls in its busiest hour, two lines will turn away about 20 percent of callers during that hour. Three lines cut it to about 6 percent, and four lines bring it to under 2 percent.
Questions for whoever provides your line
Your provider can answer three questions that settle most of this. The first is how many simultaneous calls your main number supports today. Ask for the number itself, since "plenty" or "it's a business plan" isn't an answer.
Next, ask whether forwarding happens at the carrier or inside your own phone system. If it's at the carrier, a forwarded call generally doesn't tie up your line. When your office phone system receives the call and sends it back out, each forwarded call can hold two channels for its whole length, which halves your real capacity without anyone having told you.
Finally, ask whether they can show you a busy-hour report or a count of calls that got a busy signal last month. Many providers can, and most customers never ask. If that report shows zero blocked calls, you don't have a concurrency problem, and you can stop reading about one. Bring the same question to any demo, ours included.
How GreetKeeper handles it
GreetKeeper answers concurrent calls in parallel, with no queue and no hold music, because nobody is waiting for a free agent.
Each call is its own conversation with its own transcript, so a busy hour produces separate records rather than one jumbled log.
Availability is read at the moment a slot is offered, which is what stops two simultaneous callers being given the same appointment.
Concurrency questions
How many channels do I need?
Look at your busiest hour and count the overlapping calls. Most single-location businesses need fewer than they expect, and a single analogue line is genuinely limiting.
Does a busy hour cost more?
Only in calls answered, which is the same arithmetic as a quiet one. There is no surge rate on any GreetKeeper plan.
What if several callers all want a transfer?
They queue for the person, not for the assistant. Set a fallback for an engaged transfer target, or five of them end up listening to a phone ring.
Related terms
Hear it take one of your calls
Two minutes, your own scenario, no card.