is there any native module to integrate with SMS gateways ?
Yes, we do have an in-house SMS notification module.
With the help of this module, you can send the SMS notifications to your guests on new bookings and status updates.
And by default, this module has three SMS service providers Plivo, Twilio and ClickSend.
If you want to purchase this module then create a ticket at https://webkul.uvdesk.com/en/customer/create-ticket/
And if you have some more requirement then please list them.