The controller ignores the SSID Capability Check Request message from the clients.
Preferred call is not supported for KTS CAC clients.
Reason code 17 is not supported in intercontroller roaming scenarios.
To make the KTS-based CAC feature functional, ensure that you do the following:
Enable WMM on the WLAN
Enable ACM at the radio level
Enable processing of TSPEC inactivity timeout at the radio level
Information About Key Telephone System-Based CAC
Key Telephone System-based CAC is a protocol that is used in NEC MH240 wireless IP telephones. You can configure the controller to support CAC on KTS-based SIP clients, to process bandwidth request message from such clients, to allocate the required bandwidth on the AP radio, and to handle other messages that are part of the protocol.
When a call is initiated, the KTS-based CAC client sends a Bandwidth Request message to which the controller responds with a Bandwidth Confirm message indicating whether the bandwidth is allocated or not. The call is allowed only if the bandwidth is available. If the client roams from one AP to another, the client sends another Bandwidth Request message to the controller.
Bandwidth allocation depends on the median time calculated using the data rate from the Bandwidth Request message and the packetization interval. For KTS-based CAC clients, the G.711 codec with 20 milliseconds as the packetization interval is used to compute the medium time.
The controller releases the bandwidth after it receives the bandwidth release message from the client. When the client roams to another AP, the controller releases the bandwidth on the previous AP and allocates bandwidth on the new AP, in both intracontroller and intercontroller roaming scenarios. The controller releases the bandwidth if the client is dissociated or if there is inactivity for 120 seconds. The controller does not inform the client when the bandwidth is released for the client due to inactivity or dissociation of the client.
Configuring KTS-based CAC (GUI)
Before You Begin
To enable KTS-based CAC for a
WLAN, ensure that you do the following:
Set the QoS profile for the
WLAN to Platinum.
Set the WLAN in disabled
Set the FlexConnect Local
Switching in disabled state for the WLAN (On the WLANs > Edit page, click
Advanced tab and
Switching check box).
WLANs to open the
Click the ID number of the
WLAN for which you want to configure the KTS-based CAC policy.
> Edit page, click the
Under Voice, check or uncheck
KTS based CAC
Policy check box to enable or disable KTS-based CAC for the WLAN.
Save the configuration.
Configuring KTS-based CAC (CLI)
Before You Begin
To enable KTS-based CAC for a WLAN, ensure that you do the following:
Configure the QoS profile for the WLAN to Platinum by entering the following command:
config wlan qoswlan-idplatinum
Disable the WLAN by entering the following command:
config wlan disablewlan-id
Disable FlexConnect Local Switching for the WLAN by entering the following command: