Fixed assertion failure one Invitation.send_invite() on error cases

darcs-hash:20090303124250-58103-96eafd4c05381cd48280412e7ffefe10c06e63a8
fix "-a bonjour" in sip_im_session

darcs-hash:20090303125043-b2873-126abb625d712a282b813a981de6d2b86eb18e4d