John,

One of the advantages of most IP phones is that you only need to run one
connection per office.  To facilitate this, IP phones often contain a two
port hub or switch (one port to for LAN and the other for a user's
computer.)  In this scenario, the phone is in the same VLAN as the user's
PC.

As long as your network does not get too congested and especially if you
have QoS capable switches, this should work fine.  However, if you really
want to spend time running twice as many connections and using twice as many
ports, the phones and the PBX would be very happy on their own VLAN.

-Joe

FYI:  Cisco mentions both options in:
http://www.cisco.com/univercd/cc/td/doc/product/voice/ip_tele/avvidqos/qosph
one.htm


-----Original Message-----
From: John Brandis [mailto:[EMAIL PROTECTED]] 
Sent: Wednesday, September 04, 2002 4:31 PM
To: [EMAIL PROTECTED]
Subject: VOIP and subnets [7:52688]


Hi All,

planning for my new corporate network, i have decided that the company needs
8 different networks to work efficiently, all vlans are class c's, such as
10.64.0.0 -10.64.7.254

I have planned this well, and have a plan to fit into my OSPF design.

Today, just found out, that my company has just purchased 500 nec ip phones
and the appropriate PBX. As I have no experience with voip, could some one
please tell me, if its a best design principle, to have the IP phones in
subnets of there own, such as VLAN 7 & 6, are just phones, nothing else ?

Thanks all

John



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