Changed the service parameter (SIP Expires Timer) on the nonworking node (Sub-B) from default of 180 sec to 240 sec and tested the call. it worked fine. The SIP Invite was sent with 'Expires' header of 240. Changed the parameter back to default and tested the calls again. 'Expires' header came up correct with 180 sec and the calls are now successful.
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.