Applies To



Calls fail with the system returning a 488 Not Acceptable Here error message.

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

Cause: Unsupported Codecs

If this error appears in the call logs, check which codecs are 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 Session Description Protocol.


Cause: Incompatible Encryption

If media Encryption is selected in the PBX/Trunk services Configuration page on the portal then confirm if the platform expects to be using media encryption. 


Enable/Disable Media Encryption on the PBX/Trunk settings page of the portal.


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