asterisk : Asterisk: A Modular Open Source PBX System ( http://www.asterisk.org/ )
asterisk-addons : Additional Plugins for Asterisk ( http://www.asterisk.org/ )
asterisk-app_backticks : lets you execute a shell command and capture it's output ( http://www.pbxfreeware.org/ )
asterisk-app_changrab : Take over a channel or originate a channel from the CLI ( http://www.pbxfreeware.org/ )
asterisk-app_conference : Asterisk application plugin for conferences ( http://iaxclient.sourceforge.net/ )
asterisk-app_contest : Asterisk plugin to set up a contest where caller X wins ( http://www.pbxfreeware.org/ )
asterisk-app_distributor : Distribute calls between multiple targets and can be used for load ballancing ( http://www.pbxfreeware.org/ )
asterisk-app_event : Asterisk plugin to generate a manger event from the dialplan ( http://www.pbxfreeware.org/ )
asterisk-app_iconv : Asterisk application plugin for character conversion ( http://www.mezzo.net/asterisk/ )
asterisk-app_intercept : Asterisk plugin to intercept an unanswered call ( http://www.pbxfreeware.org/ )
asterisk-app_ldap : Asterisk application plugin to do lookups in a LDAP directory ( http://www.mezzo.net/asterisk/ )
asterisk-app_notify : Asterisk application plugin to notify users ( http://www.mezzo.net/asterisk/ )
asterisk-app_rtxfax : Asterisk applications for sending and receiving faxes ( http://www.soft-switch.org/ )
asterisk-app_valetparking : Asterisk Call Parking plugin ( http://www.pbxfreeware.org/ )
asterisk-cdr_shell : Asterisk plugin to use an external shell script for cdr handling ( http://www.pbxfreeware.org/ )
asterisk-chan_misdn : Asterisk channel plugin for mISDN ( http://www.beronet.com/ )
asterisk-chan_ss7 : Asterisk SS7 channel plugin ( http://www.sifira.com/chan-ss7/ )
asterisk-chan_visdn : ( http://www.visdn.org/ )
asterisk-format_base64 : Asterisk file format for MSGSM (WAV49, BASE64 Encoded) ( http://www.pbxfreeware.org/ )
asterisk-res_perl : Asterisk ... JavaScript ( http://www.pbxfreeware.org/ )
asterisk-sounds-au : Australian sounds for Asterisk ( http://www.openvoice.com.au/ )
asterisk-sounds-de : German sounds for Asterisk ( http://www.beronet.com/index.php?option=com_content%26task=view%26id=50%26Itemid=1%26lang=en )
asterisk-sounds-it : Italian sounds for Asterisk ( http://mirror.tomato.it/ftp/pub/asterisk/suoni_ita/ )
asterisk-sounds-se : Swedish sounds for Asterisk ( http://www.danielnylander.se/asterisk-saker/ )
bayonne2 : GNU Bayonne2 ( http://www.gnu.org/software/bayonne/ )
callweaver : Community-driven vendor-independent cross-platform Open Source PBX software. ( http://www.callweaver.org/ )
callweaver-svn : Community-driven vendor-independent cross-platform Open Source PBX software. ( http://www.callweaver.org/ )
dahdi-tools : Userspace tools to configure the kernel modules from net-misc/dahdi ( http://www.asterisk.org )
openpbx_org-svn : ( http://www.asterisk.org/ )
openser : Open SIP Express Router ( http://www.openser.org/ )
sipp : A free Open Source test tool and traffic generator for the SIP protocol ( http://sipp.sourceforge.net/ )
wanpipe : Linux Voice TDM/WAN Router Package ( http://www.sangoma.com/ )
zaptel : Drivers for Digium and ZapataTelephony cards ( http://www.asterisk.org )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a voip
For Paludis use this rsync : rsync://gentoo.zugaina.org/voip-portage
If you have a problem : ycarus(-at-)zugaina.org