Layer 5 - Session layer
voip
VoIP works on telephone or cellphone connected to the internet and computer. It uses internet networks and not telephone networks.
UDP
UDP - primarily for speed is used to transport voice packets in a VoIP deployment.
Transport layer TCP/IP Protocols are TCP and UDP
VoIP has its own modem and it will connected to your broadband modem. Try to read some articles in myofficephonesystem.com for more information about VoIP services.
The application that depend on RTP is VoIP layer 4
The application that depend on RTP is VoIP layer 4
VoIP is an internet Voice Over Internet Protocol. Its a phone system that uses internet networks and not telephone networks.
The similar technologies that works like voip is the cellular phone. When there is signal , cell phone can make a call, same as VoIP when there is internet VoIP phones can be used too. They are both portable, accessible, and can be monthly bill or prepaid payment basis.
In order to become a VoIP reseller you will need to have the knowledge of how VoIP works and what VoIP are currently used. You will also have to decide the application you wish to sell and once that is done you will have to decide which server you would want to resell. When all of that is completed you can contact the companies that offer the VoIP service and inquire directly about becoming a salesperson.