When do you recommend to use Vlans (for Voice and for Data). A nice link.
Actually the network has almost 400 PC and 250 IP Phones and all these are in a plane network, the network doesn't have vlans to separate the data and voice traffic (hard client) so I think that this is causing a problem with the voice quality, is that there is a lot of noice, a robotic voice in an IP Phone-to IP Phone call in the HQ using G711.
All the access switches are 2960 and the main switch is a 2960G (need to replace for a L3 switch).
Thanks for your suggestion