nua: optionally include answer in 1XX response.
The SDP answer is included in non-realiable 1XX response, if NUTAG_EARLY_ANSWER(1) is included in nua_response() tags, or the user SDP is specified with SOATAG_USER_SDP() or SOATAG_USER_SDP_STR() in nua_response() tags. test_basic_call.c: added test_basic_call_2() for testing the call setup where 180 contains the answer and the SDP in 200 OK is ignored. darcs-hash:20060907141236-65a35-e0364e67f4c5d446bf7195e1c5dc721ddaaa0894.gz
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