Voice-over-IP service has finally become a viable alternative to a fixed landline. We look at some options and alternatives as I search for my perfect provider ...
A known bug in Vista's TCP stack has not been fixed for RTM. The network throughput suffers immensely (ie. is very very slow) for Vista machines
when stateful packet inspection (SPI) feature of the certain firewalls
(Checkpoint is one) is enabled. This is due to the new autotuning feature of the TCP stack in
Vista. Microsoft took some liberies with the RFC specs to gain a little bit of performance, where as some firewall vendors don't allow for those types of changes to the TCP streams. Always check with your firewall vendor to see if there is an updated firmware available which handles Vista correctly. If that fails, you can fix this problem on Vista itself.
