Phone numbers & limits - Uplift AI API Docs

What you get on day one, and what to ask for when you outgrow it.

Phone numbers

Outbound calls use our pool of Pakistani numbers by default, so a customer may see a different number on each call. Want a number of your own? Email founders@upliftai.org and we assign one within a day. Depending on your setup, it can take inbound calls too.

Limits

Area	Limit	Default
Phone calls	Calls in parallel	1, shared by inbound and outbound. Raised on request, into the thousands — see concurrency
Campaigns	Number of campaigns	Unlimited
Team	Team members	Unlimited
API	Request rate	150 requests per minute, per endpoint
Contacts	Per append	1,000 inline, 5,000 from a file or sheet
Contacts	File upload	10 MB, CSV or Excel `.xlsx`
Contacts	Attributes per contact	1,500 bytes
Calls	`additionalInstructions`	2,000 characters
Calls	`variables`	3,000 characters, keys up to 64. The model sees up to 30 fields, 160 characters each
Tools	Webhook tool answer	10 seconds
Webhooks	Delivery answer	10 seconds, 4 attempts
Records	Sessions and failed deliveries	Kept 90 days
Records	Recording link (`audioUrl`)	Valid 1 hour

Need more? Every limit can be raised on request. Email founders@upliftai.org with your use case.