Tom, how many time you think is needed to write H.323 protocol stack for basic VoIP (including RTP, H.225, H.245)?
Cisco IP-Phones 7940, 7960 supports Skinny (native protocol) and there are SIP and (maybe not yet publicly availbale) MGCP downloadable s/w versions. Cisco CallManager supports H.323, Skinny, MGCP (no SIP).
PS. I enjoyed “bell-head” term 🙂