Could it be possible to make returning parked calls send a different alert-info header to make phones sound differently and/or at least add a caller ID prefix to alert users the call has been parked?
Also I have been trying to make the inbound calls alert-info work but I believe the header is not getting sent out properly when using PJSIP, here is the line in the log showing the header:
[2020-02-20 17:16:10] VERBOSE[1678][C-00000165] pbx.c: Executing [XXXXXXX9238@incoming-calls:4] SIPAddHeader("PJSIP/oak-00000567", "Alert-Info:external") in new stack
SIPAddHeader would only work when using SIP not PJSIP right?