2 domain controllers with IP phones

January 22, 2009 at 19:00:18
Specs: Windows 2003 server, Server
I need some help. I am trying to figure something out. I have IP phones, two offices, two firewalls, and two domain controlers. My phones in office A are hitting my DC in office B. My IT guys say it is normal but I don't trust the answer. It is not like it is every once in a while it is all day every day. My thoughts are that the pc's and phones in A should only touch DC A and the pc's and phones in B should only touch DC B and then DC A and B should talk to each other. I not tech trained so I need you help. :) Some of my PC's in A are also hitting DC B but it is just every once in awhile.


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January 22, 2009 at 19:57:39
If you have 2 domain controllers but only one domain, I would expect some type of collision.

The best I could find on google explained the use of VLANs to avoid that. Ask your IT guy what he thinks.


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January 23, 2009 at 06:09:33
Well, I work as a network technician and we employ VoIP at work.

I'm not sure how it works in a small environment as we have our own PBX (phone) switch and use VoIP controllers that interface with our PBX switch. But if I understand it correctly and you're getting your VoIP through your ISP or a 3'd party, the VoIP traffic should flow from your network to the VoIP providers VoIP controller and from there to the telephone system.

I can tell you this. Our VoIP traffic never goes near our DC's. It doesn't have to. It goes from VoIP phone to the VoIP controller to the PBX switch and from there to the telephone system.

Your's shouldn't either unless your DC is your gateway to the external network (internet).

What you could do is get the TCP/IP configuration from your VoIP phones and from your two DC's and paste it in here and I could tell you if the traffic is indeed flowing through your DC's.

I do have to ask though, what exactly do you mean by "hitting" and explain also how you know your VoIP phones are hitting the DC's in question? I confess I have a certain amount of curiosity as to how a guy who's "not tech trained" figures out that his VoIP phones are "hitting" the DC's.

Oh, as to the "Some of my PC's in A are also hitting DC B but it is just every once in awhile." that's not unusual or unexpected. If there are services or files on DC B that PC's in A need to access, if follows logically that they will 'hit' it.

Using VLAN's to segment your domain is all nice and dandy (we VLAN extensively where I work) if you have need to. But if you don't, then you're looking at having to purchase VLAN capable equipment (switches/routers etc) and those do get pricey. Just by way of example, our layer 3 high density switches run around $5,000.00 each.

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January 23, 2009 at 06:41:34
Do we have one domain with two DC's or do we have two forests?
Do we know Brandi.w?

Reason I ask is each office should be in its own subnet. This is something that should be accounted for in AD Sites and Services.

But then are we in a routed environment or a bridged one?

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January 23, 2009 at 07:57:35
Oh so I think this might answer everyone's questions. :) We have one domain and two domain controls. One in Lima, Peru and the other here in the states. The Phones in lima are showing up on my hostwatch on my firewall connecting to the DC in Charlotte. You can see the IP for the phones and the destination is the DC. Maybe it is not as cut and dry as I think but who knows. It looks like they are traveling through our VPN tunnel and talking to our DC.

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January 23, 2009 at 08:07:15
Where is the phone control located? In other words do you have software for the phones loaded on the dcs?

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January 23, 2009 at 09:08:47
The phones are plug and play with an external PBX with Packet8.

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January 23, 2009 at 10:14:36
I would have to imagine that you have these phones at both ends so the company can communicate.

Are the phones from Charlotte showing up as trying to talk to the dc in Lima?

If you are absolutely sure that you are seeing the phones wanting to talk to the DC, I would contact Packet8 and have a talk with them.

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January 24, 2009 at 05:43:11
If you are absolutely sure that you are seeing the phones wanting to talk to the DC, I would contact Packet8 and have a talk with them.

Agreed. If you're not in control of your own VoIP controller then you need to speak with whoever is. I know with our phones, even with calls inside the same building (ie: let's say I phone my fellow network technician and coworker) they are routed through the controller and the PBX, not the DC.

You stated up front that you're not the IT guy. My honest opinion is to leave this alone and just do your job and don't try to do the IT persons job for them. You're giving yourself unneccessary worry over things that apparently don't really concern you.

Not to be rude but, the best that can happen when somebody who's not in-the-know starts messing into things is troube. You know what they say about too many cooks right. My golden rule has always been "if it ain't broke, don't fix it". If everything is working then just leave it alone.

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January 26, 2009 at 07:10:22
Everything concerns me. I am the Office Manager and considering I regularly have to train IT people and I set everything up in my company it is all my business. It is not working right and it is broken. It is causing extra traffic on my VPN and I don't need that. Thanks for everyone's help I will do my searching elsewhere.

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January 28, 2009 at 07:59:46
You "train" IT people yet can't figure this out yourself.

What comes immediately to my mind is, "the blind leading the blind"

I guess you're just too cheap to pay for a real IT person who knows their stuff. Oh well, as you're finding out, you get what you pay for in this world.

You've had plenty of good advice you've obviously not taken in this thread so all I can do is say "good luck, you're going to need it"

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January 29, 2009 at 22:52:26
Darn good answer, Curt. From the sound of it though I don't think that's the type that ever learns.

Assume that I already did an Internet search.

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