Is there a way to monitor how many lines are in use and whether a customer would have received a busy signal? We have added a few new employees and suddenly we have customers indicating they are getting a busy signal when calling us. Previously we handled all calls through a couple of VoIP phones but we've recently started using desktop/smartphone apps.

I don't know if this is a configuration issue, if calls are being forwarded (thus tying up an incoming and outgoing line) or something else that would account for this. It would be nice to graph how many of our lines were in use during a time period.

My assumption is that an extension to extension call shouldn't use one of the main lines, right? Up until now, everyone was in the same office so we chatted in person. Now with two locations there are many internal communications being done between extensions.

Thanks!

--Ed