Wimax the future
Okay. I just finished a Wimax (802.16e) deployment so I am a little biased. I do however feel that 802.16e is the future. There is argumentatively more support in the Wimax community than there is in the pure VOIP community. I have just finished the first ever 802.16e implementation and I am amazed on how many new devices support WIMAX. If deployment of WIMAX became global it could single handedly end GSM. Look at the specs up to 70mbs, 500 meters per cell as opposed to 600 meters for GSM, not only can WIMAX support VOIP and internet, but look for widespread RFID and mobile computer support as well.
There are only a handful of projects this far in my career that I would find intreaging to either design or participate in, one would be another WIMAX implementation that includes IPTV another would be a pure IPTV implementation since I have yet to deploy IPTV.
One thing that still bothers me in the VOIP field is most people operating in VOIP or VOIP security have no idea what IMS is still. I ran into a guy who works for a leading VOIP integration company with the title of IMS Security consultant, I asked him what Secure P-CSCF products does he sell, he never heard of a PCSCF.
There is still job security in VOIP.