FS-5682 --resolve missed a spot on the stable port

src/mod/endpoints/mod_sofia/sofia_glue.c

@@ -2680,7 +2680,7 @@ switch_status_t sofia_glue_do_invite(switch_core_session_t *session)
 		tech_pvt->nh->nh_has_invite = 1;
 	}
 
-	if ((mp = sofia_glue_get_multipart(session, SOFIA_MULTIPART_PREFIX, tech_pvt->local_sdp_str, &mp_type))) {
+	if ((mp = sofia_glue_get_multipart(session, "sip_multipart", tech_pvt->local_sdp_str, &mp_type))) {
 		sofia_clear_flag(tech_pvt, TFLAG_ENABLE_SOA);
 	}