nua_respond(nh, SIP_200_OK,
                    SIPTAG_CONTACT_STR("toto@10.175.2.7" ),
                    SOATAG_USER_SDP_STR("v=0\r\n"
                    "m=audio 5004 RTP/AVP 0 8 3 101\r\n"
                    "a=rtpmap:101 telephone-event/8000\n"
                    "a=fmtp:101 0-15\n"),
                    SOATAG_AUDIO_AUX("cn telephone-event\n"),
                    NUTAG_INCLUDE_EXTRA_SDP(1),
                    TAG_END());