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VoIP provider saying QOS is not possible on supplied equipment?

Posted on 2012-04-09
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Last Modified: 2012-04-26
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!
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Question by:257Roberts
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Expert Comment

by:Brian
ID: 37825825
What they should have said is that your firewall cannot do QOS and Bandwidth management with their equipment. As they said, their device must be right on the public internet. You cannot put anything in front of it really. There are a few "invisible" devices, but no need to go in to those.

I will preface this with, this will work if your Voice and Data LANs are separate. The good news is you actually do not need to manage the VoIP to improve things. Putting QoS on it would be nice, but not necessary. Use the Sonicwall to manage the Data connections. Set them to a less than default QoS setting, and set a bandwidth limit that will leave enough room for your VoIP.

If your networks are heavily intertwined, push on your vendor for how they recommend implementing a solution. Any VoIP vendor worth dealing with can explain how to implement QoS with their equipment.
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Author Comment

by:257Roberts
ID: 37825978
Our firewall vendor has said they can put one of the SonicWall interfaces (physical ports) to "transparent" mode, use one of our unused public IP addresses and have the VoIP vendor connect their equipment directly to the SonicWall port.  The firewall vendor says the QOS will work if the VoIP vendor will do this.  Guess this will work? Thanks for your reply.
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Accepted Solution

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257Roberts earned 0 total points
ID: 37876285
We did the above solution and it works great.  VoIP vendor had to call SIP provider to have them reconfigure for new Public IP, but after that great call quality.  thanks.
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Author Closing Comment

by:257Roberts
ID: 37896099
Was only think that worked.  Would like to leave to let others who have similar situation learn from my research.
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