register后就发送启动这个，uregister后就关闭

var hearbeatTime = 30000;
var hearbeatHandle;
function heartbeatStop() {
    window.clearInterval(hearbeatHandle);
}
function heartbeat() {
    hearbeatHandle = window.setInterval(() => {
        var transport = simpleUser.sessionManager.userAgent.transport;
        if (transport && transport.sendKeepAlive) {
            transport.sendKeepAlive();
        }
        console.log('保持连接');
    }, hearbeatTime);
}

转载请注明：SuperIT » sipjs.js手动保持keepalive的设置