/** DTMF digit event from the remote party. */
export interface DtmfEvent {
    /** The pressed digit. SIP emits `0`–`9`, `*`, `#`; WS input also accepts `A`–`D`. */
    digit: string;
    /** Duration of the tone in milliseconds, normalized by the channel when available. */
    duration: number;
}
/**
 * Incoming SIP INFO on a live call leg — mid-call signalling only.
 *
 * The host exposes **`contentType` + `body` only**. SIP headers on the INFO
 * request (e.g. `X-language`) are **not** forwarded. Prefer
 * {@link import('./sip').ChannelSip.dtmf$} for DTMF. Start-of-call INVITE
 * headers are {@link import('./sip').ChannelSip.inviteSipHeaders}, not this type.
 */
export interface SipInfo {
    /** MIME content type (e.g. `"application/dtmf-relay"`, `"application/xml"`). */
    contentType: string;
    /** Raw message body as received from the stack (not INFO SIP headers). */
    body: string;
}
/** Low-level Sofia SIP stack state-change event (see also {@link import('./sip').SipState}). */
export interface SipSignal {
    /** Raw telephony/Sofia call state string (not normalized to SDK {@link import('./sip').SipState}). */
    state: string;
    /** SIP response status code when present (e.g. `180`, `183`, `200`, `486`). */
    statusCode?: number;
    /** SIP response reason phrase when present. */
    statusPhrase?: string;
    /**
     * SDP body attached to **this** state callback only.
     *
     * Often empty on `active` (200 OK) when SDP was already received on an earlier 183/INVITE.
     * Use {@link import('./sip').ChannelSip.remoteSdp} for the persisted negotiated SDP.
     */
    sdp?: string;
}
/** Arbitrary data message used for WS data-channel communication between script and client. */
export interface DataMessage {
    /** Event name / type identifier. */
    event: string;
    /** Event payload. Keep it JSON-serializable for WS clients and worker proxying. */
    payload: unknown;
}
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