question

The Call Park functionality on our Cisco 508g phones has been hit-or-miss lately. We'll have clients call, then we'll park them. Once the appropriate user punches in the correct digital extension, we get a recording saying the call is no longer available. Most of the time, however, the client is still on hold! We're only able to confirm this when the client calls us back after waiting on hold for 10-ish minutes. Obviously, this does not help our business image. Does RingCentral have any solutions/fixes for this? We've noticed the error typically occurs with annoymous callers, but not exclusively... Thanks.