Controller Based WLANs

Why does no audio stream occur between two VoIP phones even though the call was set up successfully?

by on ‎07-05-2014 07:54 AM

Products and Software: This article applies to all mobility controllers that have ArubaOS 3.4.0.1 or 3.4.0.2 installed.

 

 

When a voice license is installed on the controller, the user must not use the disable-scanning option in the access control list (ACL) for voice traffic. If the disable-scanning option is enabled on the ACL, the call setup will complete successfully, but the RTP sessions for the audio will be denied by the controller.

 

 

Example of an incorrect ACL definition:

ip access-list session skinny-acl
any any svc-sccp permit disable-scanning queue high
!

 

 

Example of a working ACL definition:

ip access-list session skinny-acl
any any svc-sccp permit queue high
!

 

 

You can use the 'show datapath session table <client IP address>' command to determine if the RTP sessions are being blocked by the controller.

 

 

The D flag indicates that the session has been denied by the controller.


12.215.80.18 12.215.80.19 17 23729 20641 0 0 0 0 tunnel 12 10 FDC
12.215.80.18 12.215.80.19 17 23728 20640 0 0 184 0 tunnel 12 11 FDC

 

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