Controller Based WLANs

How does VOIP Call Capacity option work in CAC Profile?

by ‎05-17-2016 10:51 AM - edited ‎05-17-2016 10:51 AM
Q:

How does VOIP Call Capacity option work in CAC Profile?



A:

The VOIP Call Capacity option is part of the CAC Profile.

(Aruba7010) #show wlan voip-cac-profile default

VoIP Call Admission Control profile "default"
---------------------------------------------
Parameter                                                                           Value
---------                                                                                      -----
VoIP Call Admission Control                                            Disabled
VoIP Bandwidth based CAC                                             Disabled
VoIP Call Capacity                                                                 4----------------------->Changed it to 4. Default is 10
VoIP Bandwidth Capacity (kbps)                                     2000
VoIP Call Handoff Reservation                                          20 % ----------------CHR Limit (Default)
VoIP Send SIP 100 Trying                                                   Disabled
VoIP Disconnect Extra Call                                                Disabled
VOIP TSPEC Enforcement                                                  Disabled
VOIP TSPEC Enforcement Period                                     1 sec
VoIP Drop SIP Invite and send status code (client)       486
VoIP Drop SIP Invite and send status code (server)      486
 

  • The call count is set to 4
  • The CHR limit is set to 20%

Now, 20% of 4 is 0.8 which means that out of a call count of 4, the count of 3 will be used for clients on the same AP while the remaining count (1) will be reserved for roaming clients.

This is the reason that the moment, the call count crosses 3, the AP will send the de-auth.

So, in case we would like to have 4 calls per AP, we should keep the VOIP call capacity as N+1 (N--> No of calls required). This will ensure that CHR limit is met as well.

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