Nodes
A node is a single unit of work in a flow — playing audio, collecting input, making an API call, or branching based on a condition. Each node has:- Type — A unique identifier (e.g.,
startNode,ivrsMenuNode) - Category — Grouping for the node palette (System, Audio, Logic, Input, Integration, Utility)
- Configuration — Settings specific to that node type
- Output handles — Named exit points that connect to the next node
Edges
An edge is a connection from one node’s output handle to another node’s input. Edges define the path a call takes through the flow. Each output handle can connect to exactly one target node.Output handles
Output handles are the exit points of a node. They appear as connectable ports on the right side of a node in the visual editor. Each handle represents a possible outcome — where the flow goes next. For example, a Transfer node has three output handles:- Successful — the call was connected
- Timeout — nobody picked up
- Failed — the transfer could not be completed
Static vs. dynamic handles
Some nodes have static handles — a fixed set of outputs defined by the node type (e.g., Condition always hasTrue and False).
Other nodes have dynamic handles — outputs that change based on configuration:
- IVR Menu creates a handle for each DTMF key option you configure
- Switch creates a handle for each case plus a default
- Percent Routing creates a handle for each route
Variables
Variables store data that persists across nodes within a single call. They’re used to:- Store caller input (digits, speech transcripts)
- Save API response data
- Track loop counters
- Pass context between nodes
Setting variables
Use the Set Variable node to set values from static text or expressions. Many nodes also automatically set output variables — for example, Collect Digits stores the collected digits in a variable.Referencing variables
Reference variables in text fields using double curly braces:Output variables
Certain nodes produce output variables — structured data that downstream nodes can reference. For example:| Node | Output variables |
|---|---|
| Collect Digits | digits, digit_count |
| Speech Input | transcript, confidence |
| API Call | body, status_code, headers |
| Database | rows, row_count |
| Play Audio | duration |
| AI Agent | transcript (array) |
| Transform | result |