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2.2.1.9 Extensions to Server Header

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The Server header is specified in [RFC3261] section 20.35. Implementations conformant with this specification SHOULD<12> set the value of the Server header to the literal string "RTC/4.0".

The ABNF, as defined in [RFC5234], for the Server header specified in [RFC3261] section 25.1 is restricted as follows:

Server =  "Server" HCOLON "RTC/4.0" / "RTC/3.5" / "RTC/3.0"