Applies To



Explanation of Behaviour
There are two primary reasons a “488 Not Acceptable Here” response is seen: Unsupported Codecs and Incompatible Encryption.

Unsupported Codecs

If this error in the call logs, start by checking the codecs being sent to the portal. Try limit the codecs to the most common used to see if that resolves the issue. PCMU and PCMA are recommended choices.

  • The portal provides an option in the portal to filter on the Codecs. Note that this is a restrictive filter, so codecs that are missing will not be negotiated. The codecs selected here are in order of preference, which will then be reflected in the SDP.


Incompatible Encryption

Confirm if the platform expects to be using media encryption. If so, enable this in the PBX/Trunk settings page.


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