Any extra fine tuning / configuration to be done for Client / Voice Roaming .

Question

Dear Folks,
Is there any additional configuration to be done on the 5508 WLC for Wireless Laptop / Voice Roaming ? I tested with Wireless IP Phone and found some blankness in voice , whereas i have other access point nearby , which wasn't switching over easily .
Regards,
SID                   

Answer 1

Hi,
When working with Cisco IP phones as mention before, we need to comply with the following
configuration on the WLC to avoid connectivity issues as per the deployment
guide of the 7921 and 7925 IP phones.
Here is the link for the deployment guide of the 7921 and 7925.
http://www.cisco.com/web/strategy/docs/healthcare/7921dply.pdf
http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7925g/7_0/english/deplo
yment/guide/7925dply.pdf
The WLC version must be 4.0 or higher (show sysinfo)
The current phone version is under: Status > Firmware Version
App Load ID CP7921G-1.0.2.LOADS 1.0.5 is available on the web & should be
used: http://www.cisco.com/cgi-bin/tablebuild.pl/ip-7900ser-crypto
The 11M rate should be set for 'basic' & the 18-54M rates as optional
This will show up in the "802.11B Configuration" "Operational Rates" section
of the 'show run' as:   
802.11b/g 1M Rate & others............................ Disabled
802.11b/g 11M Rate........................... Mandatory
802.11g 54M Rate & others............................. Supported
If the rates lower than 11 (such as 5.5) are needed, the lowest rates should
be the 'Mandatory'
The 12M rate should be set for 'basic' & the 18-54M rates as optional
This will show up in the "802.11A Configuration" "Operational Rates" section
of the 'show run' as:   
802.11a Operational Rates
    802.11a 6M Rate.............................. Disabled
    802.11a 9M Rate.............................. Disabled
    802.11a 12M Rate............................. Mandatory
    802.11a 18M Rate............................. Supported
    802.11a 24M Rate............................. Supported
    802.11a 36M Rate............................. Supported
    802.11a 48M Rate............................. Supported
    802.11a 54M Rate............................. Supported
If 802.1X authentication is in use, CCKM should be employed.
This will show up in 'show wlan ' as:
CCKM.................................... Enabled
TKIP encryption is recommended.
This will show up in 'show wlan ' as:
    WPA (SSN IE)............................... Enabled
         TKIP Cipher............................. Enabled
         AES Cipher.............................. Disabled
      WPA2 (RSN IE).............................. Disable
         TKIP Cipher............................. Disabled
         AES Cipher.............................. Disabled
The DTIM period should be set for '2' under the wireless/network settings.
This will show up in 'show run' as:
DTIM Period...................................... 2
The beacon interval should be set for '100' under the wireless/network
settings.
This will show up in 'show run' as:
Beacon Interval.................................. 100
WMM should be enabled on the wlan.
This will show up in 'show wlan ' as:
WMM.............................................. Allowed
The wlan QOS should be set to platinum.
This will show up in 'show wlan ' as:
Quality of Service............................... Platinum (voice)
Under Controller, arp unicast should be disabled
This will be in 'show network' as:
ARP Unicast Mode........Disabled
Under Controller > QOS, the platinum QOS setting should have 802.1p chosen
and the tag set to '6'
This will show up in 'show qos platinum' as:
protocol......................................... dot1p
dot1p............................................ 6
Per WLAN CAC is set under the wlan - 'AP CAC limit'.
This will show up in 'show wlan ' as:
Dot11-Phone Mode .......................... ap-cac-limit
LAN "dhcp address assignment required" should be 'disabled'.
This will show up in 'show wlan ' as:
DHCP Address Assignment Required................. Disabled
Aggressive load-balancing should be disabled (under 'network'
settings).
DTPC should be enabled under wireless > network
This will show up in 'show run' as:
DTPC  Status..................................... Enabled
If no legacy clients need long preamble, set the preamble for 'short'
under wireless > network.
This will show up in 'show run' as:
Short Preamble mandatory......................... Enabled
If using eap-fast with the WLC, the 802.1x timeout is 2
seconds.  This is not enough time for the IP phone to download and process
the PAC.  The timeout can be increased:
"config advanced eap request-timeout 20"
"save config:
In the 7921 phone, unlike with the 7920 phone, 'auto' does not mean eap-fast
or leap, it means 'leap' with wpa2, leap with wpa2, or wpa-psk.
If you want to use EAP-FAST, then use EAP-FAST mode, not 'auto'.
For 7921-7921 conversations to work, 'peer-to-peer blocking' needs to be
'off' under the 'controller' tab (this is off by default).
In later code, the DFS settings under Wireless > 802.11A/N
DFS(802.11H) should be:
Power Constraint off
Channel Announcement on
Channel quiet mode on.
These values will appear in 'show 802.11h' as:
802.11h ......................................... powerconstraint :  0
802.11h ......................................... channelswitch :  Enable
802.11h ......................................... channelswitch mode :  1
Do *not* turn on 802.11b/g/n > EDCA parameters 'low latency mac' -
make sure that is disabled.
This will appear in the output of 'show 802.11b|802.11a' as:
Voice MAC optimization status.................... Disabled
802.11b/g/n > EDCA parameters - set for WMM
'Single AP Mode' should be disabled on the phones (unless there *is*
only a single AP).
The RF values seen by the phone are under Settings > Status > Site Survey