Merged revisions 334156 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

........
  r334156 | mnicholson | 2011-08-31 13:50:33 -0500 (Wed, 31 Aug 2011) | 4 lines
  
  Disable T.38 when we get a invite with image media port set to 0
  
  ASTERISK-17678
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@334157 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -9221,6 +9221,7 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req, int t38action
 				}
 			}
 		} else {
+			change_t38_state(p, T38_DISABLED);
 			ast_udptl_stop(p->udptl);
 			if (debug)
 				ast_debug(1, "Peer doesn't provide T.38 UDPTL\n");