SIP RFC defines the character set used under the SIP URI. It classifies the charcter set in diff categories like reserved, unreserved and some are define but can't be used in uri as they are meant for specific purpose.
characters set which is not allowed in a SIP uri is normally represented using a escaped sequence which look like "%" followed by "Hex" "Hex".
So basically the control character are not allowed in a SIP URI, both because they are non-printable and because they are likely to be misinterpreted by some control mechanism.
The percent character "%" is excluded because it is used for encoding the escaped characters.
so to answer to your question in short, you can't use the "%" sign in a SIP URI.
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.