Merged revisions 233394 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

........
  r233394 | mnicholson | 2009-12-07 10:14:42 -0600 (Mon, 07 Dec 2009) | 8 lines
  
  Do not reject SDP packets describing only non audio streams.
  
  (closes issue #16387)
  Reported by: zalex1953
  Patches:
        media-level-c-fix1.diff uploaded by mnicholson (license 96)
  Tested by: mnicholson, zalex1953
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@233396 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -8357,7 +8357,7 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req, int t38action
 
 
 	/* Sanity checks */
-	if (!hp) {
+	if (!hp && !vhp && !thp && !ihp) {
 		ast_log(LOG_WARNING, "Insufficient information in SDP (c=)...\n");
 		return -1;
 	}