SDP_ATTR_INVALID
vp->flags = SDP_ATTR_INVALID;
values[n].flags = SDP_ATTR_INVALID;
sdp_attr_t proto = { SDP_ATTR_INVALID,0,sizeof(buffer),buffer };
values[i].flags = SDP_ATTR_INVALID;
if (values[i].flags == SDP_ATTR_INVALID )
attr.flags = SDP_ATTR_INVALID;
values[n].flags = SDP_ATTR_INVALID;