Number Pools

Number Pools group your phone numbers into rotating caller-ID sets for outbound campaigns. Rotating caller IDs spreads call volume across numbers, which protects their reputation and keeps answer rates healthy. Pools live in Studio → Manage → Number Pools. Every voice campaign must have a pool with at least one active number before it can launch.

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Creating a Pool

1. Click New Pool. A two-step wizard opens: Configure → Add Numbers.
2. Enter a Pool name and choose the Caller ID rotation mode:
   • Sequential — cycle numbers in order (least-recently-used first).
   • Random — pick a random number for each call.
3. Select at least one of your provisioned numbers. You can buy a new number inline — purchased numbers are auto-selected for the pool.
4. Click Create Pool.

You can also create a pool without leaving a campaign — the campaign’s Caller ID pool selector links here when no pools exist.

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How Rotation Works

For each outbound dial, the dialer:

1. Prefers active numbers with full STIR/SHAKEN “A” attestation; if none qualify, any active number is used.
2. Orders candidates least-recently-used first, then applies the pool’s rotation mode.
3. Records the call against the chosen number (total calls, last call time).

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Number Health

Each number in a pool carries health signals, visible on the pool detail page:

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Automatic protection

• Spam checks — every number added to a pool is checked against carrier spam intelligence, and all active pool numbers are re-checked on a daily sweep. Numbers that score as spam-likely are flagged in every pool that contains them (spam reputation is global per number). You can also run Check spam status on demand.
• STIR/SHAKEN registration — numbers added to pools are automatically registered for STIR/SHAKEN attestation, so outbound calls sign with full “A” attestation.
• Attestation monitoring — live call results feed each number’s attestation level back into the pool. A number that drops below “A” is automatically flagged and removed from preferred rotation.

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Managing Pools

• Edit — rename the pool or switch rotation mode at any time (takes effect on the next dial).
• Add number — add any provisioned workspace number not already in the pool.
• Remove from pool / Retire — take a number out of rotation without releasing it.
• Delete pool — removes the pool and its memberships (the numbers themselves are kept). If campaigns are assigned to the pool, the Studio lists them and offers Unassign & Delete.

The pool detail page also lists the Assigned Campaigns currently using the pool.

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Pools and Campaign Runs

When a campaign launches, the run freezes a snapshot of the pool (name, rotation mode, and its active numbers with attestation levels) for the audit record — visible on the run detail page. Live dialing still follows the pool’s current membership, so numbers you flag or retire mid-run leave rotation immediately.

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Where to go next