BetaOptional BetacallCustom headers sent in the call setup as SVAML extra info. At most 16 headers; each key must be 1-255 characters, and each value at most 255 characters.
Optional BetaserviceIdentifier of a Sinch Voice V2 Service whose configuration (webhooks, signing credentials, call behaviours) governs the dial. When omitted, the project's default Service is used.
Optional BetastreamAudio stream configuration.
Options for dialing a stream destination through the Sinch Voice V2 platform.