Index: src/mod/endpoints/mod_sofia/mod_sofia.c
===================================================================
--- src/mod/endpoints/mod_sofia/mod_sofia.c (revision 8853)
+++ src/mod/endpoints/mod_sofia/mod_sofia.c (working copy)
@@ -414,7 +414,13 @@ static switch_status_t sofia_answer_chan
        switch_channel_set_variable(channel, "sip_nat_detected", "true");
    }
 
-
+   {
+       char *p;
+       if ((p = strstr(tech_pvt->local_sdp_str, "/3"))) {
+           *p++ = ' ';
+           *p = ' ';
+       }
+   }
 
    nua_respond(tech_pvt->nh, SIP_200_OK,
                NUTAG_AUTOANSWER(0),