Apart from a demonstration server hosted by Lotus/IBM, no. This protocol is designed to connect to a Lotus/IBM Sametime server running on a corporate LAN.
Sametime support in Pidgin depends on a separate library called Meanwhile. You
will need to install the Meanwhile library and the libpurple-meanwhile (or
similar, depending on distribution) package to enable Sametime support. If you
are building Pidgin from source, then the Sametime plugin will be built
automatically if you have the development headers for Meanwhile installed.
The Sametime server to which you’re attempting to connect has been configured
with a whitelist of acceptable clients. This error indicates that the client ID
used by Pidgin (0x1700) is apparently not in that whitelist, so the server
denies your login. You can cause Pidgin to masquerade as the default Sametime
Connect client by setting the “Hide client identity” option in your account
preferences.