There are at least two reasons:
However in the next releases jSDP will provide a JSR 141 implementation, but its API will remains unchanged.
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The Java API for SIP Signaling provides an SDP library that implements an early version of JSR 141, but it's a bit outdated.
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Various flavors of Windows (95, 98, NT, XP, 2000), Mac OS X, and multiple UNIX systems (Linux, Solaris, HPUX).
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