Cisco QoS for 3560 Switch, Cisco 1242 Wireless AP's and Siemens HiPath phone system with Siemens Optipoint WL2 handsets

Hi,
I have a client who has about 7 x Siemens Optipoint WL2 wireless VoIP handsets configured to talk to a Siemens HiPath system (I dont have any experience with Siemens kit) - or much experience with QoS for that matter - but Im a fast learner ;)

I am however, competent in dealing with most other aspects of cisco kit (just to give you guys an idea on where Im at)

The wireless setup consists of 4 x Cisco 1242AG Access Points all connected to a Cisco 3560.
The wireless access points are also used by a handfull of roaming users with laptops.

A lot of calls being made using the handsets are affected badly by echo.

So, Im guessing I need to look into the QoS options in a bit more detail - firstly, the access points do have some basic QoS configuration (based on tech notes I obtained from the Siemens phone system installers) - but nothing has been done on the switch (I should mention that the phone system is also plugged into the same 3560 switch).

The QoS configuration in the wireless access points is in the code snippet.

The wireless access points are also configured with multiple ssid's - But only two, one of which links directly to an ADSL router for visiting sales reps etc..to allow net access (via VLAN configuration on the AP's and 3560) and the other handles the data and voice traffic for the corporate LAN (i.e. the handsets and the company laptops connect to this ssid) - and of course both ssid's are encrypted.

Any assistance on configuring up the QoS would be appreciated - Oh, and I am waiting for the Siemens phone installers to get me more info on what (if any) qos options there are within the phone system.

Cheers

Paul

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dot11 phone
 
class-map match-all _class_VoiceQOS1
 match ip dscp ef
class-map match-all _class_VoiceQOS0
 match ip dscp default
class-map match-all _class_VoiceQOS2
 match ip dscp af31
 
policy-map VoiceQOS
 class _class_VoiceQOS0
  set cos 0
 class _class_VoiceQOS1
  set cos 6
 class _class_VoiceQOS2
  set cos 1
 
interface dot11radio0.1
service-policy output VoiceQOS
 
Interface FastEthernet0.1
service-policy input VoiceQOS
service-policy output VoiceQOS