Joel,
Can you share the doc that you read?
CIPC binds to and uses the network adapter that you specify under the Network 
Preferences configuration, it does not use CDP to determine which interface/IP 
Address to use.

Administration Guide for CIPC version 2.1
http://www.cisco.com/en/US/docs/voice_ip_comm/cipc/2_1/english/administration/guide/cag21ovr.html#wp1043898
Voice quality can be compromised on an IP device by data traffic. Because Cisco 
IP Communicator is a software-based phone instead of a hardware phone, you 
cannot solve this problem by isolating voice-over-IP traffic to an auxiliary 
VLAN. Instead, you must modify QoS parameters in the network so that voice data 
traffic is prioritized over generic data traffic. 



 Jeff Knuckle 

-----Original Message-----
From: ccie_voice-boun...@onlinestudylist.com 
[mailto:ccie_voice-boun...@onlinestudylist.com] On Behalf Of Joel Jose
Sent: Thursday, August 13, 2009 4:41 AM
To: ccie_voice@onlinestudylist.com
Subject: [OSL | CCIE_Voice] cipc gets voice vlan through "switchport voicevlan" 
??

hy people,

does cipc get vlan through cdp?? i have read in cisco.com that it does
indeed happen... but i have tried many times and could not make it
happen. when i have to put it in the voice vlan i have to give "access
vlan command" to the switchport.

one reason the voice vlan command doesnt work may be because the pc
port doesnt know how to tag them...(i've tried only on older switches
so need to make the port trunk manually)... may be newer switch models
have no such problems(but dual vlan is still  a mini trunk right so
does pc port know how to deal with it?)... i have noticed that when i
install cipc, it also installs many networking stuffs like qos and cdp
support..(check network properties)...

joel.
-- 
"it's not the years in your life that count. It's the life in your
years." Abraham Lincoln
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