I find out a solution (It's not really great, but it works). I configured Forward no Answer of the Remote Ip phone line with his PSTN number
Ex: if your corporate number is 2126 and it's PSTN Number is 04305252126.Please put Forward No Answer to 04305252126.
When Wan is down the remote phone is unregistred from Corporate CallManager. So Forward No Answer will work in this case. I know there is some side effects of this configuration. If the remote phone will no answer, call will be routed also via PSTN.
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.