VoIP
FTP (File Transfer Protocol) is an Internet protocol that allows file downloads and uploads. Other such internet protocols are torrent and P2P.
RTP
Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (e-mail) transmission across Internet Protocol (IP) networks
Voice over Internet Protocol
IMAP and POP.
internet protocol
Internet Protocol (IP)
VoIP, Voice over Internet Protocol.
A proprietary network protocol is one that does not comply to any open standards. The intent of a proprietary protocol is to limit communication only to nodes that implement a specific application. NetBIOS is an example of a proprietary network protocol that is only applicable to Microsoft Windows hosts. The opposite of a proprietary protocol is an open standard, which can be utilized by any application. An example of an open standard is TCP/IP, the standard protocol of the Internet.
Transmission control protocol/Internet Protocol or TCP/IP
The AH (Authentication Header) protocol and the ESP (Encapsulating Security Payload) protocol both function within the network layer. They are part of the IPSec (Internet Protocol Security) standard.