[cisco-voip] QoS configuration for environment with 7921 wirelessphones

[Jason Aarons (US)]

I would sniff the interface for the WLC and see how the packets are
marked in regards to DSCP -jason

 

________________________________

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Brian
Sent: Tuesday, November 25, 2008 7:25 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] QoS configuration for environment with 7921
wirelessphones

 


I've been banging my head trying to get a proper QoS configuration in
our infrastructure.  I've gone through the QoS SRND and Voice over
Wireless Design Guide, but am still not seeing the correct DSCP markings
on the 7921G wireless phones when I call to the PSTN.  When I log into
the web interface of the 7921 and look at the Stream statistics, I see
the correct Receiver DSCP of EF, EF for calls between 7921 phones.
However, when I make or receive a PSTN call from a 7921 phone, the
Receiver DSCP says Default, Default.

Here is the quick rundown of the environment.

PRI connected 2851 - 12.4(15)T3
3560G - 12.2(44)SE1
WLC4402 running 5.1.151 with 1131 AP's
CUCM 6.1.2.1000-13
7921's with 1.2.1 firmware

The WLC switchport is configured with 'mls qos trust cos' and the AP
switchports are all configured with 'mls qos trust dscp' per the Voice
over Wireless Design Guide.  I've used the WLC Config Analyzer tool to
ensure all of the proper voice settings for WMM, 802.1p, etc., etc.  The
CallManager and 2851 switchports are trusting cos.  The 2851 has the
following QoS config:

class-map match-all SCCP
 match access-group name SCCP
class-map match-all RTP
 match access-group name RTP
!
!
policy-map Voice
 class RTP
  set dscp ef
 class SCCP
  set dscp cs3
!
!
ip access-list extended RTP
 permit udp any range 16384 32767 any
 permit udp any any range 16384 32767
ip access-list extended SCCP
 permit tcp any eq 2000 any
 permit tcp any any eq 2000
!
interface GigabitEthernet0/0
 service-policy input Voice
 service-policy output Voice



When I look at the policy-map on the voice gateway router, I see almost
all of the packets being matched in the RTP class so I feel like it is
being marked properly in and out of the gateway.  It seems like I am
missing something simple here because this is not a difficult QoS
environment.  Does anyone have any ideas?


Thanks in advance,
Brian








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