Call parking/transfer fails at random

[Jaap]

I'm having trouble transferring calls with my t22p's as they fail at random. Normally the caller should get music on hold (and when they do it works great), but often they don't get any music and we can't transfer the call to another extension.

Somehow the call doesn't seem to park as it should. I'm having the same problem at all my yealink's.

Any ideas of settings I could try?

Regards,


Jaap