What are the URI/URL schemes for most IM networks?

Question

I am looking for information abou URI schemes for most used IM/chat networks and phone.

Looking for URI for

• phone number tel: - already solved, RFC 3966
• yahoo ymsgr:addfriend?yourid
• skype
• msn
• XMPP/Jabber/Google talk
• sip:[email protected], also used by Microsoft Office Communicator

Note, I know that Skype supports callme:// but I don't know if this is specific to Skype or where is the syntax described.

Answer 1

To anyone who still finds this relevant, here's what I gathered:

• Email - mailto:<email>?[Subject|CC|BCC|Body]
• Phone - tel:<number>
• SMS - sms:<number>
• IRC - irc://<url>:[port|channel|password]
• FaceTime - facetime:<number>
• Skype - skype:<username|number>?[add|call|chat|sendfile|userinfo]
• Hangouts (formerly Google Talk) - gtalk:[chat|call]?<email> com.google.hangouts:[chat|call]?<email>
• Windows Live Messenger (formerly MSN) - msnim:[add|chat|voice|video]?<email>
• Yahoo! Messenger - ymsgr:[sendim|addfriend|sendfile|call|callPhone|chat|im|customstatus|getimv]?<email|number>
• AIM - aim:[goim|goaway|addbuddy]?<username>
• QQ - mqq://<url>
• ICQ - icq:message?uin=<number>
• Jabber - as already answered: http://xmpp.org/extensions/xep-0147.html