Problem: The RADIUS SIP-AVP attributes are not imported into openser's AVPs
Answer: Make sure the RADIUS dictionary of radiusclient is complete and understands the SIP-AVP attribute (225). Also if there are other RADIUS attributes in the RADIUS response, they must be defined in the dictionay, otherwise radiusclient will discard all RADIUS attributes (also the known ones).
Problem: No RADIUS packets are sent from OpenSER
Answer: One possible problem that stops the Radiusclient library from sending out data, is if the servers configuration file for radiusclient-ng is not readable by the OpenSER user. After a default install of radiusclient-ng, the servers file is only readable by root, so if your OpenSER server is not running as root, the file persmissions will need to be changed.
Problem: Can't authenticate sip client with digest authentication
Answer: The problem is dictionary.radius don't have the attribute Digest-User-Password. Add this to dictionary.radius: ATTRIBUTE Digest-User-Password 1073 string