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Please see here all relevant information surrounding Castel products and systems.
How do I upgrade a Castel CAP IP intercom?
How do I upgrade a Castel Xellip 2 intercom?
How do I use the Castel IP search tool?
(COMPLETE GUIDE) How do I set-up a Castel Xellip2?
How do I set a Grandstream GPX1625 for Castel use?
How do I set a Grandstream GXV3240 for Castel use?
How do I set up a Grandstream for Castel use?
How do I set a relay on a Xellip desk screen for an incoming call?
How do I restore a back-up to a Castel panel?
How to Set up a Castel SIP Pack