ComSIPL is a SIP/UDP/IP based Communication Server and Proxy
For Voice / Presence / Video / Instant Messaging communication use.

Tested and working software clients:
Application OS Auto Register Instant Message Place and Receive CallsPublish PresenceSubscribe/NOTIFY Presence
Twinkle Linux ✓PIDF
MicroSIP Windows ✓PIDF
Linphone Linux NO
Linphone Windows NO
Linphone Andriod NO
Zoiper5 FreeWindows Not a client option
Pidgin Linux Not a client option ✓PIDF + PIDF:IM
Pidgin Windows Not a client option ✓PIDF + PIDF:IM
3CXphone Windows Not a client option Yes, but not correctlyNO

Software clients that do not work:

Application OS
Gnome-calls Linux
Cisco Jabber Window
Cisco IP Communicator Windows

Software clients currently testing:

Application OS
3CX Windows