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Definition

What is parallel dialing? SAGARIS on where it stops

Parallel dialing places several calls at once and connects the rep to whoever answers first.

That is the easy half. The half nobody writes down is what happens to the second person who answers, how often that happens, and the rule that puts a number on it.

1Rounds in an hour

3600 / (c + A x t)

A = 1 - (1 - p)^n is the chance that at least one line connects.Each round yields n x p expected connects.

2Connects arriving with nobody free, per round

n x p - (1 - (1 - p)^n)

Exact under the model's assumptions: independent lines at one connect rate.

n
lines
p
connect rate
c
seconds per round
t
seconds per conversation

Both formulas are set as text so you can check them.

The arithmetic nobody publishes

A dialing round launches one attempt per line and costs a fixed number of seconds. When somebody answers, the rep stops dialing and talks. Those two facts are the whole model, and they pull against each other.

One round of five lines. The first answer becomes Connected; the losing legs are cancelled; a second live answer is held.
Formula 1

Why throughput flattens

The talking term sits in the denominator, so every connect you win takes time out of the part of the hour that does the dialing. Adding lines stops helping well before it stops costing.

Formula 2

How often two people answer at once

A round is n independent trials at probability p, and the rep can take exactly one. The second formula is the expected connects minus the chance that at least one arrives. Doubling the lines does not double the conversations; it raises the share of connects with nobody free faster than it raises conversations.

The rule below

What the second person hears

Explainers tell the collision from the rep's side, where a line simply drops. On the other side, somebody stopped what they were doing and said hello. In a dialer with no recorded message, they hear silence or a click. They know your number called and nobody was there, which is what the rule below exists to limit.

What another line buys, at one set of inputs

Illustrative inputs
What another line buys at illustrative inputs (5 percent connect rate, 4-minute conversations, 30-second rounds): expected connects per hour and the share of connects with nobody free, for 1 to 10 lines. SAGARIS dials up to 5; 6 and 10 are published ceilings at other vendors.
Lines1 line2 lines3 lines4 linesSAGARIS ceiling5 linesA published ceiling at another vendor6 lines7 lines8 lines9 linesA published ceiling at another vendor10 lines
Expected connects per hour4.36.78.49.710.711.512.313.013.614.3
Connects with nobody freeBar: 0 to 100 percent0.0%2.5%4.9%7.3%9.5%11.7%13.8%15.9%17.8%19.7%

Illustrative inputs: a 5 percent connect rate, 4-minute conversations, 30-second rounds. The model's own output, not a benchmark.

Change the inputs in the calculator

The rule that puts a number on it

US federal telemarketing rules set a ceiling on abandoned calls and define what counts as one. The definition is stricter than most people assume.

3%

The most a single calling campaign may abandon of the telemarketing calls a person answers live, measured over 30 days.

The ceiling

"Abandon more than three percent of all telemarketing calls that are answered live by a person, as measured over a 30-day period for a single calling campaign."

47 CFR 64.1200(a)(7)

The definition

"A call is 'abandoned' if it is not connected to a live sales representative within two (2) seconds of the called person's completed greeting."

47 CFR 64.1200(a)(7)

Two seconds after the greeting, not two rings.

A collision with no rep free meets that description on the face of the rule; whether the rule governs your campaigns is a question for your counsel.

In the product

How many lines SAGARIS dials

Up to five, suggested for each wave and set by the rep: more lines when a pickup looks unlikely, fewer when it looks likely, and a single dedicated line when the contacts on the wave are likely to answer.

SAGARIS caps at five. The arithmetic on this page is why a higher number buys less than it seems.

See the dialer

A person presses Start. Choosing a mode starts nothing.

Suggested per wave

  • Up to five

    When a pickup looks unlikely

  • Fewer, down to two

    When a pickup looks likely

  • One dedicated line

    When the contacts on the wave are likely to answer

Five telephone wires strung between two weathered wooden poles under a flat overcast sky, with one small bird perched on a wire.

Questions worth asking

Seven questions about lines, the pause and the rule, answered from the arithmetic above.

More questions? Talk to us
  • A power dialer places one call at a time from a list, automatically, as soon as the last one ends. A parallel dialer places several at once and connects you to whoever answers first. A predictive dialer places calls ahead of your reps based on a forecast of when one will be free. Parallel and predictive share the same failure mode: both can produce a connect with nobody available to take it. If you are moving off a power dialer, our PhoneBurner alternatives roundup sets one beside the parallel dialers buyers weigh against it, with what each publishes about lines, read at source.

  • It depends entirely on your connect rate, which is why a rule of thumb is worthless here. Run your own numbers through the calculator: the collision share is computed exactly, and you will usually find it rises faster than the conversation count does, so the useful line count is lower than the maximum on offer. If you are comparing vendors on that maximum, our Orum alternatives and Nooks alternatives pages set what each one publishes beside the ceiling of five described below. Connect rate also turns on the number your call shows: our US area codes by state lookup lists which codes serve each state, if you are choosing local numbers for a territory.

  • Because several calls went out in the same round, and when somebody picks up the system has to notice the answer, settle which line won and open an audio path to the rep. That is the pause. It is a property of dialing more than one line at a time rather than a fault in any particular product, and the honest answer is that the window exists and is short, not that it is absent. On SAGARIS the rep is bridged onto the answered line rather than held shut until the system has settled whether it reached a person or a voicemail: that classification keeps resolving while the rep is already talking, and a line it calls a voicemail is detected and the leg is held. The rule quoted above is the yardstick from the answering side: if a live representative is not on the line within two seconds of your completed greeting, the call counts as abandoned.

  • Only by giving up parallel dialing. A dialer that places one call at a time has nothing to decide, because the rep is already sitting on the only line that can ring. Running several lines buys conversations and costs a short window at the start of each one, and that is the trade in a sentence. A description of parallel dialing with no window in it at all is describing a single-line dialer.

  • Under 47 CFR 64.1200(a)(7) a call counts as abandoned if it is not connected to a live representative within two seconds of the person's completed greeting, and a collision where no rep is free plainly meets that description. So yes, on the face of the rule. Whether the rule governs your particular campaigns is a separate question that turns on who you are calling and from where, and it is one for your counsel.

  • No, and the arithmetic on this page says why rather than asking you to take it on trust. Conversations take time out of the same hour the dialing has to happen in, so throughput flattens as lines go up. Doubling the lines does not double the conversations; it raises the share of connects with nobody free faster than it raises conversations.

  • Up to five, and the count is suggested for each wave and set by the rep: more lines when a pickup looks unlikely, fewer when it looks likely, and a single dedicated line when the contacts on the wave are likely to answer. SAGARIS caps at five. The arithmetic on this page is why a higher number buys less than it seems. Nooks vs Orum reads what two other vendors publish about their own line counts, and on which pages, at source and dated.

3600 / (c + A x t)n x p - (1 - (1 - p)^n)

Put your own connect rate through both formulas.

The calculator runs the same two formulas on your inputs, seven line counts side by side, with its assumptions printed.

SAGARIS is pre-launch. If you need a dialer running at full scale this week, another option is the safer choice.