Long awaited in the list, voice support for pidgin for GNU/Linux is out, most of them were on Skype all these days for Voice and Video, not any more i feel, with this advancement it's nice to hear and talk also.

Howto install from source:

For Ubuntu user, you may just setup from PPA :

To setup the PPA, copy-and-paste these commands into a terminal:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com \ 67265eb522bdd6b1c69e66ed7fb8bee0a1f196a8
echo deb http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu \ `lsb_release --short --codename` main | \
sudo tee /etc/apt/sources.list.d/pidgin-ppa.list

sudo apt-get update && sudo apt-get upgrade

To compile from source :

1. Get the source from : < a href="http://biznetnetworks.dl.sourceforge.net/project/pidgin/Pidgin/2.6.1/pidgin-2.6.1.tar.bz2" target="_blank"> Source

2. Extract and cd the directory pidgin-2.6.1.

3. sudo ./configure && make && sudo make install

Other packages that might be of your interest :
pidgin-encryption pidgin-musictracker
pidgin-extprefs pidgin-nateon
pidgin-facebookchat pidgin-nateon-dbg
pidgin-festival pidgin-otr
pidgin-audacious pidgin-guifications
pidgin-plugin-pack pidgin-blinklight
pidgin-hotkeys pidgin-privacy-please
pidgin-bot-sentry pidgin-lastfm
pidgin-screenshot pidgin-data
pidgin-libnotify pidgin-sipe
pidgin-dbg pidgin-librvp
pidgin-themes pidgin-dev
pidgin-mpris

Screen Captured and attached.

If you failed to do so, follow the alternate method
Install these :
libgstfarsight0.10-0, libpurple0, libpurple-bin,
pidgin-data, libpurple-bin, pidgin-data and pidgin