While in DN config page: Help -> This Page
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Description
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Enter a description of the directory number and route partition. The description can include up to 50 characters in any language, but it cannot include double-quotes ("), percentage sign (%), ampersand (&), or angle brackets (<>).
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Display (Internal Caller ID)
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Leave this field blank to have the system display the extension.
Use a maximum of 30 characters. Typically, use the user name or the directory number (if using the directory number, the person receiving the call may not see the proper identity of the caller).
Setting applies only to the current device unless you check the check box at right (Update Shared Device Settings) and click the Propagate Selected button. (The check box at right displays only if other devices share this directory number.)
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EDIT: if you mean how many can you fit on the phone display, that will depend on the characters you use and is not really fixed.
HTH
java
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