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How outbound capacity works

Two things control how fast you can make calls:
  1. Phone numbers — each can make up to 75 calls/day (to avoid spam flagging)
  2. Dedicated concurrent lines — each runs one call at a time ($25/mo)
Think of phone numbers as your daily fuel and dedicated lines as how many lanes you have open on the highway.

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Phone number capacity

Each phone number is limited to protect your caller ID reputation:
  • 75 calls per day per number
  • 20 calls per hour per number (burst protection)
These are industry best practices enforced automatically. Numbers that exceed these limits risk being flagged as spam by carriers.
Phone NumbersCalls/DayCalls/MonthMonthly Cost
1752,250$10
32256,750$30
537511,250$50
1075022,500$100
251,87556,250$250
503,750112,500$500
We recommend premium numbers with local area codes ($10/mo). Contacts are far more likely to answer a call from a familiar area code.

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Dedicated concurrent lines

Each dedicated line lets you run one simultaneous outbound call. Without dedicated lines, your calls share a managed pool with other customers — during peak times, they may queue.
LinesSimultaneous CallsMonthly Cost
55$125
1010$250
2525$625
5050$1,250
When all lines are busy, new calls queue automatically and dispatch as lines free up — TCPA compliance and DNC filtering apply throughout.

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Plan by budget

Here’s what different monthly budgets get you (using premium numbers at 10/mo+linesat10/mo + lines at 25/mo):
Monthly BudgetNumbersLinesCalls/DayCalls/MonthCost
$1755537511,250$175
$350101075022,500$350
$52515151,12533,750$525
$87525251,87556,250$875
$1,75050503,750112,500$1,750
$3,5001001007,500225,000$3,500

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Plan by goal

Know how many calls you need? Work backwards:
Target Calls/MonthNumbers NeededLines NeededMonthly Cost
2,50021$45
5,00032$80
10,00053$125
25,000126$270
50,0002312$530
100,0004523$1,025
These estimates assume campaigns run during the TCPA calling window (8am-9pm, 13 hours) with an average call duration of 3 minutes.

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What happens at the limits

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When numbers are exhausted

If all your phone numbers hit their daily limit mid-campaign:
  • Remaining contacts are set to pending
  • Campaign automatically resumes the next day
  • No calls are lost — they just wait

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When lines are full

If all your concurrent lines are busy:
  • New calls queue automatically
  • They dispatch as soon as a line frees up
  • Order is maintained

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Number health monitoring

CallDesk monitors the answer rate of each phone number over the past 7 days. If a number’s answer rate drops below healthy levels (indicating possible spam flagging), it’s automatically removed from rotation.

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Recommendations

Start with 3 premium numbers and 3 dedicated lines ($105/mo). This gives you 225 calls/day — enough for most small campaigns while building number reputation.
For weekly campaigns of 500-2,000 contacts, get 10 numbers + 10 lines ($350/mo). You’ll reach 750 contacts/day and finish most campaigns in 1-3 days.
For 5,000+ contacts/week, plan for 25+ numbers + 25+ lines ($875+/mo). This gives 1,875 calls/day capacity. Consider spreading large campaigns across multiple days for best answer rates.
Studies show contacts are 2-3x more likely to answer calls from a local area code vs. a random or toll-free number. Premium numbers ($10/mo) let you pick area codes that match your target market.

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The math

Daily capacity    = phone numbers x 75
Monthly capacity  = daily capacity x 30
Numbers needed    = ceil(target calls per day / 75)
Lines needed      = ceil(numbers / 2)  (for typical 3-min calls)
Monthly cost      = (numbers x $10) + (lines x $25)

Get Phone Numbers

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Get Dedicated Lines

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