Tag Archives: Operation was unsuccessful

Skype for Business Cloud Connector Edition (CCE) – Operation was unsuccessful (504 Server time-out)

Today I’m shedding light on the SIP 504 response status code while working with Skype for Business Online’s CloudPBX and Cloud Connector Edition (CCE). The “504 Server time-out” error is masked in the Skype for Business Client as “Operation was unsuccessful” during an outbound PSTN call. Understanding this error can actually become a handy tool… Read More »