Telephony product that implement standards based VOIP (as opposed to closed p2p applications such as skype) should go into their own category in portage. I suggest net-voip, or net-telephony. At the moment applications like kphone and asterisk are lumped in with the randomness of net-misc.
There are a bunch of clients that do VOIP in net-im. kphone should probably be moved there (I'm sure it gets lonely in net-misc). The asterisk related ebuilds should go into net-telephony when there are enough of them - there are only 4 now, but I'm sure that number will grow in the future. net-misc/asterisk net-misc/asterisk-oh323 net-misc/asterisk-sccp net-misc/kphone net-misc/zaptel net-im/gnomemeeting net-im/gnophone net-im/linphone net-im/ohphone net-im/skype
was decided to not do it on -dev ML long ago