/**
 * SIP Methods
 * @internal
 */
export declare namespace C {
    const ACK = "ACK";
    const BYE = "BYE";
    const CANCEL = "CANCEL";
    const INFO = "INFO";
    const INVITE = "INVITE";
    const MESSAGE = "MESSAGE";
    const NOTIFY = "NOTIFY";
    const OPTIONS = "OPTIONS";
    const REGISTER = "REGISTER";
    const UPDATE = "UPDATE";
    const SUBSCRIBE = "SUBSCRIBE";
    const PUBLISH = "PUBLISH";
    const REFER = "REFER";
    const PRACK = "PRACK";
}