Recent Problems With Isdn Lines

[marcw]

Hello,

 

Since a couple of weeks, we are having problems with a Swyx server (2013, v.9.30.1544) that has been working fine for several years.

 

It has a QuadBRI ISDN card, and ever since the problems started, the server loses its connection to the outside lines - sometimes a couple of times per day, sometimes after a few days, so it's very irregular).  All internal calls remain possible.

There are no errors logged in the Event Log.

Restarting the server fixes the problem (for a while).

 

The setup has not changed except for regular Windows updates.

Could it be that recent Windows updates cause a problem? E.g. the update to .NET 4.5.2?

 

Any suggestions?

 

Thanks

 

Marc