# Flow block in Amazon Connect: Set callback number
<a name="set-callback-number"></a>

This topic defines the flow block for setting the number to call back the customer.

## Description
<a name="set-callback-number-description"></a>
+ Specify the attribute to set the callback number.

## Supported channels
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The following table lists how this block routes a contact who is using the specified channel. 


| Channel | Supported? | 
| --- | --- | 
| Voice | Yes | 
| Chat | No - Invalid number branch | 
| Task | No - Invalid number branch | 
| Email | No - Invalid number branch | 

## Flow types
<a name="set-callback-number-types"></a>

You can use this block in the following [flow types](create-contact-flow.md#contact-flow-types):
+ Inbound flow
+ Customer Queue flow
+ Transfer to Agent flow
+ Transfer to Queue flow

## Properties
<a name="set-callback-number-properties"></a>

The following image shows the **Properties** page of the **Set callback number** block.

![\[The properties page of the Set callback number block.\]](http://docs.aws.amazon.com/connect/latest/adminguide/images/set-callback-number.png)


## Configuration tips
<a name="set-callback-number-tips"></a>
+ The [Store customer input](store-customer-input.md) block often comes before this block. It stores the customer's callback number.

## Configured block
<a name="set-callback-number-configured"></a>

The following image shows an example of what this block looks like when it is configured. It has the following branches: **Success**, **Invalid number**, and **Not dialable**.

![\[A configured Set callback number block.\]](http://docs.aws.amazon.com/connect/latest/adminguide/images/set-callback-number-configured.png)


1. **Invalid number**: The customer entered phone number that is not valid.

1. **Not dialable**: Amazon Connect is unable to dial that number. For example, if your instance is not allowed to make calls to \$1447 prefix phone numbers, and the customer requested callback to a \$1447 prefix number. Even though number is valid, Amazon Connect cannot call it. 

## Sample flows
<a name="set-callback-number-samples"></a>

Amazon Connect includes a set of sample flows. For instructions that explain how to access the sample flows in the flow designer, see [Sample flows in Amazon Connect](contact-flow-samples.md). Following are topics that describe the sample flows which include this block.
+ [Sample queue configurations flow in Amazon Connect](sample-queue-configurations.md)
+ [Sample queued callback flow in Amazon Connect](sample-queued-callback.md): this sample only applies to previous instances of Amazon Connect.

## Scenarios
<a name="set-callback-number-scenarios"></a>

See these topics for scenarios that use this block:
+ [Set up queued callback by creating flows, queues, and routing profiles in Amazon Connect](setup-queued-cb.md)
+ [Queued callbacks in real-time metrics in Amazon Connect](about-queued-callbacks.md)