Outbound numbers

Add phone numbers your business owns, assign them to templates, and set per-number limits.

Outbound numbers are the phone numbers your campaigns call from. Each number is registered with a telephony provider (Twilio, Plivo, or Exotel) and assigned to one or more templates.

Add a number

1. Open Numbers in the dashboard and click Add number.
2. Pick the provider (Twilio, Plivo, Exotel).
3. Enter the number in E.164 format (e.g. +14155551234).
4. Paste the provider credentials the admin gave you.
5. Save.

Assign to templates

Under each template, open Numbers and pick the outbound number(s) this template can use.

A template can use multiple numbers — useful when you’re scaling out and want the load spread across a pool. The system picks an available number at call time.

Per-number limits

Numbers carry two limits you can tune:

• Max concurrent calls — how many calls this number can be handling at once. Telephony providers cap this per account tier; check the provider’s dashboard for your limit.
• Max calls per hour — rolling-window cap; useful for TRAI compliance and mindful scaling.

How concurrency is tracked

Concurrency is enforced per outbound number. Behaviour differs by provider:

• Twilio — the number is marked IN_USE for the duration of one call. A Twilio number handles a maximum of one concurrent call regardless of the channel count set on the outbound number.
• Plivo / Exotel — a channel counter increments with each active call, up to maximum_channels set on the outbound number. Multiple concurrent calls are allowed.

If you need more concurrency on Twilio, assign the template multiple numbers and the scheduler spreads load automatically.

The platform also enforces a global outbound rate limit per destination phone number — see Outbound rate limiting (operator docs) for how that works under the hood.

Inbound on the same number

A number registered for outbound is automatically eligible for inbound. See Inbound and IVR.