Advanced steps

Enable ASR biasing, DTMF collection, and function references in flow steps for precise control.

Advanced steps give maximum control over transitions, ASR biasing, and DTMF collection. They are intended for developers who need precise control that Default steps cannot provide.

ASR biasing options (per-step)

Advanced steps support structured ASR biasing modes for common input types:

Mode	Use case
Alphanumeric	Booking references, confirmation codes
Name spelling	Phonetically spelled names
Numeric	Ages, short numbers
Party size	Group booking numbers
Precise date	Specific calendar dates
Relative date	Flexible time references (“next Tuesday”)
Single number	One-digit responses
Time	Spoken times
Yes/No	Confirmation-style responses
Address	Postcodes, street names
Custom keywords	Your own keyphrases

See ASR biasing in flows for full details.

DTMF configuration (per-step)

Advanced steps can collect DTMF (touch-tone) input. Configure:

Setting	Description
Enable DTMF	Toggle on to accept keypad input
Inter-digit timeout	How long to wait between digits (default 3 seconds)
Max digits	Maximum number of digits to collect (1-32)
End key	Which key signals input is complete (#, *, or none)
Collect while speaking	Whether to accept input while the agent is talking
Mark as PII	Flag the collected input as personally identifiable information

See DTMF in flows for full details.

Rich text references

Advanced step prompts support inline references using template tags:

Reference type	Syntax	Purpose
Transition function	{{ft:functionId}}	Call a transition function from the prompt
Global function	{{fn:functionId}}	Call a global function
SMS template	{{sms:templateId}}	Send an SMS template
Handoff	{{ho:destinationId}}	Trigger a handoff
Variant attribute	{{va:attributeId}}	Insert a variant attribute value

Related pages

No-code flows overview

Step types, routing logic, and canvas controls.

Entities

Configure entity types and validation for your flows.

ASR biasing

Improve transcription accuracy for structured inputs in flow steps.