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I'm implmenting VoIP on our network across 30 buildings on a University campus. Would it be best to put all the VoIP phones into a single vlan or splits them in separate vlans for each building? Am using a software based PBX system (Asterisk).

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  • How many phones? How good network?
    – TomTom
    Mar 28, 2011 at 11:34
  • Could potential expand to about 450 phones on a fibre network with a 10Gbps back bone. Running Cisco 6500 core and distribution L3 switches. Mar 28, 2011 at 16:35
  • Should not make a difference then. One VLAN should be enough. 450 phoens is not a lot of load SIP wise, and for the RTP traffic it should not be a lot and makes no difference either.
    – TomTom
    Mar 28, 2011 at 19:08
  • @TomTom Thanks for your advice. At what quantity of VoIP phone would you suggest separate vlans. And what would be your implementation method? Just for knowledge and reference Mar 29, 2011 at 15:19
  • Depends, but possibly 4 digits. Phones are very static, little updates, low traffic. 450 phones possibly does no mean a lot of stuff around. I would definitely route the normal lan, but a sip phone vlan... sounds like very inactive to me.
    – TomTom
    Mar 29, 2011 at 15:30

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This is really more of a 'it depends' thing. Keep in mind that any more configuration you do will add to your management overhead. One advantage of putting them all in a separate subnet/VLAN is that you might be able to do better QoS or anything on them.

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