We have a UC520 with 8 ports of analog lines - all ring to a 7961 reception desk that does not experience the problem. When the receptionist is away calls are answered via GroupPickup by 7941 phones. every 3rd or 4th call answered this way experiences one way talk path. The internal users cannot hear the outside caller, but the caller can hear the internal user.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.