I have a question someone with a lot more knowledge about VoIP than I have might be able to answer for me. Our organization is having trouble reserving enough bandwidth for consistent VoIP call quality. We purchased a higher-end SonicWall firewall that will do QOS along with many types of bandwidth management. Now our VoIP vendor is telling us that they cannot run the VoIP traffic through our firewall. This is the reason they are giving us:
"You cannot NAT/Route voice through a firewall. The device on site is a SBC(Session Border Controller) and it has to sit out on the pubic IP Space."
They are saying their device is not able to do QOS either. All of the internet traffic and the VoIP traffic goes out the same bonded T1 circuit (3mpbs). I don't understand why they cannot configure their PBX to use the firewall as the gateway or even to replace some of their equipment to allow prioritization to achieve somewhat consistent call quality. If I need to supply any additional information to have you better assist me, please post back. Thanks!