Firstly please unlearn “wanna”. It is not an English language learner’s mistake, it is something you have actually learned. I can put down the other English lanuguage errors (e.g. “i” and missing articles) to not being familiar with the language, but not “wanna” (or “ur”). There is no such word in my concise English dictionary, and there are actually very few Engish auxiliary verbs that be used without a following full infinitive.
The “t” extension is not used by normal applications, and only used in the context of extensions (Read reads a number which may or may not be an extension). It is used when overlapped dialing is in use and either not enough digits have been enterered to match any extension, or the Dial application receives an indication that a number is valid but incomplete.
A timeout of the Read application is signalled by setting the READSTATUS variable to “TIMEOUT”.
You might also want to note that voipinfo.org isn’t the most reliable source of information, and, in this case, fails to describe the READSTATUS variable. To get the official documentation for Read, type “core show application read” at the CLI prompt.