I think I've got things sorted at home, just switched off the auto-config and everything is working okay.
At work, everything is still crashing so here is my set-up.
Two office computers - both Dell running XP and Vista
Webcams connected to each computer - Logitech C160m (they are working fine)
Wireless cams - Airlink 747W (crashes icam when they are connected)
The iphone is connected through 3G when I get the connection errors. When I come into the office in the morning the icam source has crashed.
I have clearwire towers that connect through LinkSys VoIP boxes for both internet and phones that then connect to the router.
Router - Belkin N+ F5D8235-4 (changed the router a few weeks ago)
select auto-config at work and I get the UPnP Dual NAT exp_ip: 192.168.15.4
I think that covers everything