Shared parking problems (sync loss)

[Vince19]

Hi,

Im running a bunch of hosted PBX's 70+ in our VMWARE (VPN Tunnel to site where phones are) environment and see to be having a problem with one PBX and shared parking,

• After putting the same caller in parking +-2-3 times the parking will stay red and you can no longer put them back, you can then try to transfer them but the call will sometimes drop after that
• Light BLF show green even though parking is in use

There are two Receptionists experiencing the same problem,
So we are experiencing very inconsistent problems relating to parking, this site relies heavily on using the Shared parking function
I would like to make sure im not missing something obvious, also would like to know how exactly the SP function works on a sip/ip level to help with my diagnostics,


This seems to have happen all of a sudden,

Any assistance will be appreciated

Thanks

Professional Annual
18.0 (Build 418)
16SC
Server OS: Debian 10
Firewall green
Provision with URL VPN from site to hosted server
No custom phone templates/Did use another phone to test same result

Devices in use
Tested with a T43U and EXP43 same problem
Currently using T27G and EXP20

The selected system is not the on in question

 

[Vince19]

Update:
I can see call on hold in SP1 for instance but the BLF on the phone is green,