Back in the day, you used to order a special phone company circuit for pay phones, but modern pay phones will connect to a standard analog line. That means you can plug a payphone into an FXS port on your Cisco System (using an ATA, or a VG gateway). However, it's recommended to order a direct line from the telco for your payphone, instead of connecting it behind your Cisco switch (for fraud prevention purposes).
Cisco doesn't manufacture payphones, so you'll need to go with a third party manufacturer. Just google "payphones," and you should find plenty in the range of a few hundred dollars or less. Any quality third party manufacturer should work fine.
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.