What are concurrent call limits in the AI4CALL portal?

Concurrent call limits (also called simultaneous call limits) in the AI4CALL portal set how many calls your service can handle at the same time. They stop a traffic spike from overwhelming your voice assistant and running up usage you didn't plan for. You set the limit on two levels, per assistant and per associated phone number, and a call gets through only if it respects both.

This video tutorial, about a minute long, walks you through the Concurrent call limits section in the portal's side menu: how the limits work, where to find them and how to change them without mistakes. Setup takes just a few steps, yet it decides how many calls your AI assistant accepts at once.

Two definitions before we start. The per-assistant limit is the maximum number of calls an assistant can handle at the same time, across all its associated numbers. The per-number limit is the maximum number of simultaneous calls a single phone number can receive.

How the per-assistant limit and the per-number limit work

The two levels work together. An incoming call is accepted only if it respects both limits: the limit of the number being called and the limit of the assistant answering. If either one is exceeded, the call is rejected.

So it isn't enough for the called number to have room left: the assistant connected to that number must also be under its own limit. This double check keeps both the load on each number and the overall load on the assistant under control.

Practical examples: when a call is rejected

The information banner at the top of the section includes two examples that show how this works.

Example one. An assistant with a limit of five and two associated numbers with limits of three and three. Each number can handle up to three calls, but the total never goes above five: the sixth call overall is rejected because of the assistant's limit, even though the two numbers together could in theory reach six.

Example two. An assistant with a limit of five and two numbers with limits of two and two. Each number can receive up to two calls, and the total, four at most, stays below the assistant's limit. Here, the per-number limits are the bottleneck.

The minimum value you can set is one; the default is ten.

It's the total that decides how many calls actually get through.

AI4CALL video tutorial – Concurrent call limits

Where to find concurrent call limits in the portal

Account overview: assistants and active numbers

The two boxes at the top, Total assistants and Active numbers, show the size of your account at a glance: how many assistants you can configure and how many numbers are active, split into demo numbers, purchased numbers and your own numbers.

Resource list, filters and search

Below the boxes is a list of every resource you can work on. Use the tabs at the top to see them all together or filtered:

• All: assistants and numbers in one list
• Assistants: assistants only
• Demo numbers: demo numbers only
• Purchased numbers: purchased numbers only

Each row shows the resource, its type, the associated assistant and the concurrent limit. The search field in the top right takes you straight to the assistant or number you're looking for.

How to change and save concurrent call limits

You change the limit directly in the resource's row, using the minus and plus buttons or by typing the value in the field. While you edit, an Unsaved changes badge reminds you that the new values aren't active yet.

Changes take effect only when you click Save limits. Click Cancel to restore the previous values.

After saving, check that the assistant's limit and the limits of its numbers are consistent with each other: the real cap is the lower of the assistant's limit and the sum of its numbers' limits. Back to the examples: with numbers at three and three and the assistant at five, the real cap is five. With numbers at two and two and the assistant at five, it's four.

Frequently asked questions about concurrent call limits

What happens when a call exceeds the limit?

It is rejected. An incoming call is accepted only if it respects both the limit of the called number and the limit of the answering assistant. If either one is exceeded, the call doesn't get through.

What is the default concurrent call limit?

In AI4CALL the default value is ten, and the minimum value you can set is one.

Do limit changes apply immediately?

No. New limits take effect only when you click Save limits. Until then the portal shows the Unsaved changes badge, and Cancel restores the previous values.