> ## Documentation Index
> Fetch the complete documentation index at: https://docs.revdesk.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Call Capacity Planning

> Understand how phone numbers and dedicated lines control your outbound call throughput. Plan your setup by budget or goal.

## How outbound capacity works

Two things control how fast you can dial:

1. **Phone numbers.** Each can make up to **75 calls per day**, the limit that protects your number reputation with carriers.
2. **Dedicated concurrent lines.** Contact us for high volume.

Think of phone numbers as your daily fuel. Dedicated lines are the number of lanes open on the highway.

***

## 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 Numbers | Calls/Day | Calls/Month |
| - | - | - |
| 1 | 75 | 2,250 |
| 3 | 225 | 6,750 |
| 5 | 375 | 11,250 |
| 10 | 750 | 22,500 |
| 25 | 1,875 | 56,250 |
| 50 | 3,750 | 112,500 |

<Tip>
  We recommend **numbers with local area codes**. Contacts are far more likely to answer a call from a
  familiar area code.
</Tip>

***

## Dedicated concurrent lines

Each dedicated line gives you one guaranteed simultaneous outbound call. Without dedicated lines your calls share a managed pool with other customers, which can queue during peak times.

| Lines | Simultaneous Calls |
| - | - |
| 5 | 5 |
| 10 | 10 |
| 25 | 25 |
| 50 | 50 |

When all lines are busy, new calls queue automatically and dispatch as lines free up. TCPA compliance and DNC filtering apply throughout.

***

## Plan by budget

[Contact sales](https://cal.com/revdesk/30min) to scope phone numbers, dedicated lines, and usage for your budget.

***

## Plan by goal

Know how many calls you need? Work backwards:

| Target Calls/Month | Numbers Needed | Lines Needed |
| - | - | - |
| 2,500 | 2 | 1 |
| 5,000 | 3 | 2 |
| 10,000 | 5 | 3 |
| 25,000 | 12 | 6 |
| 50,000 | 23 | 12 |
| 100,000 | 45 | 23 |

<Note>
  These estimates assume campaigns run during the TCPA calling window (8am-9pm, 13 hours) with an average call
  duration of 3 minutes.
</Note>

***

## What happens at the limits

### When numbers are exhausted

If all your phone numbers hit their daily limit mid-campaign:

* Remaining contacts are set to **pending**.
* The campaign **resumes the next day** automatically.
* Pending contacts stay queued until they dial out.

### 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

### Number health monitoring

RevDesk 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.

***

## Recommendations

<AccordionGroup>
  <Accordion title="Starting out with outbound">
    Start with **3 premium numbers** and **3 dedicated lines**. That covers 225 calls per day, enough for most small campaigns while you build number reputation.
  </Accordion>

  <Accordion title="Running regular campaigns">
    For weekly campaigns of 500-2,000 contacts, get **10 numbers + 10 lines**. You'll reach 750 contacts/day and
    finish most campaigns in 1-3 days.
  </Accordion>

  <Accordion title="High-volume outreach">
    For 5,000+ contacts/week, plan for **25+ numbers + 25+ lines**. This gives 1,875 calls/day capacity.
    Consider spreading large campaigns across multiple days for best answer rates.
  </Accordion>

  <Accordion title="Why local area codes matter">
    Contacts are more likely to answer a local area code than a random or toll-free number. Pick an area code that matches your target market.
  </Accordion>
</AccordionGroup>

***

## 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)
```

***

<CardGroup cols={2}>
  <Card title="Get Phone Numbers" icon="phone-plus" href="https://www.revdesk.com/channels">
    Add numbers to increase your daily capacity
  </Card>

  <Card title="Get Dedicated Lines" icon="git-branch" href="https://www.revdesk.com/settings/billing">
    Add lines for guaranteed concurrent calls
  </Card>
</CardGroup>


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