• INVITE :Invites a user to a call
  • ACK : Acknowledgement of the request.
  • BYE :Terminates a connection between users
  • CANCEL :Terminates a request, or search, for a user.
  • OPTIONS :Solicits information about a server’s capabilities.
  • REGISTER :Registers a user’s current location
  • INFO :Used for mid-session signalling

It would be easy to understand the above commands with an example and will cover this in next blog