Why will the call manager need to know the mac address of the phone in the first place when a new phone was added? If the phone and call manager are in two different subnet, call manager will not be able to see the mac of the phone at all.
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.