nua_respond(nh, SIP_200_OK,
                    SIPTAG_CONTACT_STR("toto@10.175.2.7" ),
                    SOATAG_USER_SDP_STR("v=0\n\
   o=- 2 2 IN IP4 10.175.2.20\n\
   s=CounterPath X-Lite 3.0\n\
   c=IN IP4 10.175.2.20\n\
   t=0 0\n\
   m=audio 5582 RTP/AVP 0 8 3 101\n\
   a=fmtp:101 0-15\n\
   a=rtpmap:101 telephone-event/8000\n\
   a=sendrecv\n";)