SWML inbound call webhook
Payload sent by SignalWire to a SWML calling webhook URL when SWML is fetched for a call. This includes inbound calls arriving on a phone number configured with a SWML calling handler, and outbound REST-initiated calls that point at a SWML URL. The same payload shape is also used when the SWML calling transfer or execute method targets an external URL — in those cases, the params object carries the values supplied to that step.
The webhook URL is expected to respond with the SWML document to execute for the call.
Payload
Script-scope variables for this call session. Empty on the initial document fetch.
Environment variables available to this call’s SWML document, which you can reference as ${envs.<key>}. Combines the variables you’ve configured at the account or project level with any custom_variables you passed on the outbound Call commands request.
Keys are case-sensitive. When a custom_variables key exactly matches an account- or project-level variable, including case, the value from the request wins; if they differ only in case, both are kept as separate variables.
Not included on every request: treat a missing envs as a call with no environment variables.
Parameters passed via a SWML calling execute or transfer step. Included only when the step that requested this document passed params, so it is absent on the first document fetch for a call.