Merged revisions 209516 via svnmerge from

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

........
  r209516 | mmichelson | 2009-07-30 09:38:21 -0500 (Thu, 30 Jul 2009) | 8 lines
  
  Fix a crash that can result if text codecs are allowed but textsupport is disabled.
  
  (closes issue #15596)
  Reported by: fabled
  Patches:
        sip-red.patch uploaded by fabled (license 448)
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.1@209517 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -7719,7 +7719,7 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req, int t38action
 	p->peercapability = newpeercapability;		        /* The other sides capability in latest offer */
 	p->jointnoncodeccapability = newnoncodeccapability;	/* DTMF capabilities */
 
-	if (p->jointcapability & AST_FORMAT_T140RED) {
+	if (p->trtp && (p->jointcapability & AST_FORMAT_T140RED)) {
 		p->red = 1; 
 		rtp_red_init(p->trtp, 300, red_data_pt, 2);
 	} else {