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Will the opt port on a Sonicwall TZ180 act as a good interface for voip phone system?

Posted on 2011-02-28
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Last Modified: 2012-06-27
I have an existing computer network that has a sonicwall tz180 firewall, 24 port 10/100 ethernet switch, an SBS 2003 R2 server and a new polycom voip phone system that I want to implement with the existing network hardware. Will the opt port on a Sonicwall TZ180 act as a good interface for voip phone system?

The Sonicwall is providing NAT. The server is providing DHCP and DNS.
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Question by:terrytrumble
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by:digitap
ID: 34998576
does the voip phone system need to connect with an external service? what version of firmware do you have on the sonicwall? is the sonicwall OS enhanced or standard?

it would be easier to put it on the OPT port creating a completely separate subnet from the LAN. if the phone system needs to access an external voip service, then you'll want to implement QoS and bandwidth management to guarantee the internal VoIP traffic gets priority.
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by:terrytrumble
ID: 34999029
digitap,

Firmware Ver: SonicOS Standard 3.9.0.1-75

Rom Ver: 4.0.1.1

I do not have the specs to the voip system but do know that it is a polycom - cheapest version I'm sure. I am not very handy with the voip end of the configuration. A company that is providing the wan bandwidth is financing the purchase. I am installing the SBS 2003 R2 server and sonicwall TZ 180 firewall.

I cannot answer your question about the external service. BroadSmart will be the wan bandwidth carrier.

I should have more information within the hour.
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by:digitap
ID: 34999118
to me, it sounds as if you've got an internal voip solution that's self contained and there's a card in it where a PRI comes in or analog lines come in.  this should act as a simple PBX that's not VoIP.  I believe you can implement this solution without any special configurations on your sonicwall. most voip solutions can connect to the existing LAN and the computer can connect to a computer jack on the phone. you may need a poe switch to power the phones if they don't have their own ac adapter.

or, you'll need to run separate network cable separating your voip phones from your computer network.


i'll wait to hear further details.
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by:terrytrumble
ID: 34999415
Cisco hosted VOIP. They have a QoS Router they will put in then hand off to me. They actually are putting in 2 circuits. 1 data 1 voice.
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by:terrytrumble
ID: 34999429
polycom is the vendor
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by:digitap
ID: 34999523
OK...a little different, but workable. what i suspect they'll want you to do is connect the polycom system directly to their QoS router. this means that your voip phones will need to be on an isolated network from your computers. you might want to confirm this with them, though. if this is true, then you've removed your sonicwall from the equation.
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by:terrytrumble
ID: 34999630
digitap,

verifying that
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by:terrytrumble
ID: 34999838
digitap,

It turns out that there will be (2) Comcast 12/3 mbps circuits. One for voice and one for data. He did say that we will be sharing the lan cables. Does this make sense. He mentioned something about a riverbed switch with 2 wan ports.

I am sorry that I am not getting these details straight. This information is not the engineer but sales person. He gave me the number of the engineer but received voice mail.
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by:digitap
ID: 34999919
yes, i think i understand. one of the wan ports is for voice and one is for data. you'll need to know which one to use for each. still uneasy about that. you'll want o get confirmation from the engineer. i NEVER trust sales.
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by:terrytrumble
ID: 35014380
Digitap,

Spoke with engineer for voip solution.

2 ciricuits - 1 for voice the other for data.

1 managed switch.

1 ethernet drop per workstation to serve voip phone and pc.

ethernet cables will be inserted into managed switch.

2 VLANS - 1 for voip 1 for pc network.

ethernet jumper from sonicwall lan port to managed switch.

The voip network will physically be attached behind the sonicwall but will logically be separated
via the managed switch.

ethernet jumper from managed switch to voip router connected to voice wan circuit.

Is this acceptable?

 
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by:digitap
ID: 35014556
looks good for the most part. the only puzzlement that i have is how they plan on getting the voip traffic to the managed switc separate from the pc traffic. you've indicated that the pc devices will connect to the phones, so perhaps they plan on having the two on separate subnets. otherwise, i think they providing you with a solid voip solution.
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Author Comment

by:terrytrumble
ID: 35014570
exactly. I am sorry that I did not mention that. Can you think of any extra provisioning that I must do to ensure NAT behaves with this config?
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by:terrytrumble
ID: 35014575
by the way, are you burning the midnite oil or are you located west of me? i am east coast USA. I really appreciate all that you have done in helping me with this
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digitap earned 500 total points
ID: 35014598
to be honest, with the managed swith routing your pc and voip traffic, the only concern you would have is in regards to your pc traffic which is being nat'd through your sonicwall currently. it sounds as if the voip vendor is peeling off the voip traffic via the vlan and once the voip traffic gets to the vendor router, you don't have worry about it any longer. is that your perception?

i'm cst and just about to get myself ready for bed. no worries, glad i could assist!
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Author Comment

by:terrytrumble
ID: 35014623
Yes, that is what I am thinking. The voip engineer is sending me a Visio tomorrow or I should say today sometime.

I can't thank you enough digitap. I will award you the points now and close this.

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by:digitap
ID: 35017374
if anything else comes up, please post back here. i'll continue to monitor the question. thanks for the points!
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by:terrytrumble
ID: 35017734
will do.
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