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Solution
They are true, that's a lazy question, but here's my lazy answers:

1 email out is SMTP in is IMAP, video and conference might be SIP but that's also telephony.
2 Encryption tunnel, VPN is most known, I usually use SSH tunnels. I've had enough of Win2008, I use Debian now.
3 Improvise
4 My example is telephony, phones communicate to server via signaling with SIP to punch a number, then switch to RTP to transport the voice
They are true, that's a lazy question, but here's my lazy answers:

1 email out is SMTP in is IMAP, video and conference might be SIP but that's also telephony.
2 Encryption tunnel, VPN is most known, I usually use SSH tunnels. I've had enough of Win2008, I use Debian now.
3 Improvise
4 My example is telephony, phones communicate to server via signaling with SIP to punch a number, then switch to RTP to transport the voice
 
Solution