We are now in progress of configure Cisco 3600 & 2600 to enable the VOIP. We have a 32K leased line and we want to allocate 16k for data and the remaining for voice/fax. We have no problem if only data or voice is using but when both is running, I’m facing very bad quality voice. We tried enable the RSVP but no success. Or I can use ip precedence command. Please help.