# Supported flow blocks for Contact Lens integration
<a name="contactlens-integration-supportedflowblocks"></a>

The following tables list the flow blocks that you can use to specify how Amazon Connect processes the audio stream sessions. 

**Set blocks**


| Flow block | Effect | Description | 
| --- | --- | --- | 
| Set Working Queue | No Effect | Sets Working Queue | 
| Set Contact Attributes | Supported | Stores key-value pairs as contact attributes. You set a value that is later referenced in a flow. | 
| Get Queue Metrics | No Effect | Gets queue metrics | 
| Change routing priority/age | No Effect | change routing prioroty of contact | 
| Set Hold Flow | No Effect | Specifies the flow to invoke when a customer or agent is put on hold. | 
| Set Whisper Flow | No Effect | Specifies the flow to invoke when a customer or agent joined in a voice or chat conversation. | 
| Set callback Number | No Effect | Specify the attribute to set the callback number. | 
| Set Voice | No Effect | Sets the text-to-speech (TTS) language and voice to use for the contact flow. | 
| Set Customer Queue | No Effect | Sets the customer queue for customer queue flow | 
| Set Disconnect Flow | No Effect | Sets disconnect flow for disconnect queue flow | 
| Set event flow | No Effect | Specifies which flow to run during a contact event. | 
| Set routing criteria | No Effect | Sets the routing criteria for the contact. | 

**Analyze blocks**


| Flow block | Effect | Description | 
| --- | --- | --- | 
| Set Recording and Analytics behavior | Supported | Sets options for recording and enables features in Contact Lens. | 
| Set logging behavior | Supported | Enable or disable flow logs | 

**Logic blocks**


| Flow block | Effect | Description | 
| --- | --- | --- | 
| Distribute by percentage | Supported | Routes contacts randomly based on a percentage | 
| Loop | Supported | Executes looping branch for specified amount of times | 

**Branch blocks**


| Flow block | Effect | Description | 
| --- | --- | --- | 
| Check Queue Status | No Effect | Checks Queue Status | 
| Check Staffing | No Effect | Checks staffing in queues | 
| Check hours of operation | Supported | Branches based on specified hours of operation. | 
| Check Contact Attributes | Supported | Branches based on a comparison to the value of a contact attribute. | 

**Integrate blocks**


| Flow block | Effect | Description | 
| --- | --- | --- | 
| Create Task | Supported | Creates a new task manually or by leveraging a task template. | 
| Customer profiles | Supported | Enables you to retrieve, create, and update a customer profile. | 
| Invoke AWS Lambda | Supported | Calls AWS Lambda, and optionally returns key-value pairs. | 
| Invoke module | Supported | Calls a published module, which enables you create reusable sections of a contact flow. | 

**Terminate/Transfer blocks**


| Flow block | Effect | Description | 
| --- | --- | --- | 
| Disconnect/Hangup | Supported | Disconnects the contact and end the audio stream session. | 
| End Flow | Supported | Ends the current flow without disconnecting the contact. |