Phone limit for subnet

[hskrdean]

Does anyone know if there is a limit to the number of IP phones that can be assigned to a single subnet? We're not sure if we should create a subnet with a /22 for over 1000 phones, or if we can go larger.

Thanks!

 

[bigindian65]

depends on your IP setup subnet hosts vs clients

Mato' Was'aka

 

[tnphoneman]

I would divide it up to reduce the amount of traffic as much as possible to avoid bad call quality. You know like calls fro phone to phone or phone to PRI etc.

We have usually set up subnets by floor to make it easier to find the phone in question.

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[hskrdean]

tnphoneman - how many phones do you have per floor?

 

[gwebster]

There are two good reasons to limit the number of IP Phones per subnet:
- reduction in number of devices affected by broadcast traffic
- ability to determine location of the IP Phone for E911 if you are using IP-based discovery mechanisms

 

[johnpoole]

as to the original question.. you can put all your phones in a class a.. bandwidth will not be a problem on a 100 meg backbone... managing that many on one sub net..another question..

as far 911, if you have not addressed this yet,, you will.. lawyers are envolved so it will not be pretty.. we are all going to have to get a er response team to the right building, floor and wing..

my director ask, what if it just saves one life?.. my email ask, what if i just start shooting people for saying that?

john poole
bellsouth business
columbia,sc

 

[tnphoneman]

The build I was referring to had 9 floors and the number of phones varried from 50 to 150 per floor.

To make things easy we went with a /24 subnet for the PC and the Phones so PC's would be in 192.168.2.xxx and phones would be in 192.168.3.xxx for an example. Separate vlans of course.

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