If you define a Park Pilot extension on VitalPBX 4.0.0.8 (700 is default) and set up a Call Park button on a Yealink phone with the Park Pilot number defined as the Call Park Value, the system pumps out the following Notice continually for each extension that has that button defined.
[2023-01-30 14:46:09] NOTICE[738248]: res_pjsip_exten_state.c:429 new_subscribe: Endpoint ‘201’ state subscription failed: Extension ‘700’ does not exist in context ‘cos-all’ or has no associated hint