BLF lights not working after switching Asterisk to version 11

Found a strange issue after switching to Asterisk v11, the BLF buttons on our Panasonic SIP phones stopped working.

Eventually thought it was worth trying setting the ‘presence server address’ which previously hadn’t been set (and in Endpoint Manager is set to blank) to the PBX and the lights immediately started working. Much simpler solution than I anticipated.

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