Fix interpretation of PRIREDIRECTIONREASON set by chan_sip.

This commit is the simplest way to solve a problem that has already been solved
in trunk with the "COLP/CONP and Redirecting party information into Asterisk"
commit. In trunk the redirection reason is translated into a generic redirect 
reason. I would have had to do the same fix except chan_sip never reads
PRIREDIRECTREASON. So both chan_dahdi and chan_h323 have been modified to
interpret the one different redirect reason of "no-answer" properly and set the
ISDN reason code 2 of "no reply".

(closes issue #15033)
Reported by: steinwej


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.1@223405 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -3105,7 +3105,8 @@ static int dahdi_call(struct ast_channel *ast, char *rdest, int timeout)
 				redirect_reason = 0;
 			else if (!strcasecmp(rr_str, "BUSY"))
 				redirect_reason = 1;
-			else if (!strcasecmp(rr_str, "NO_REPLY"))
+			else if (!strcasecmp(rr_str, "NO_REPLY") || !strcasecmp(rr_str, "NOANSWER"))
+			/* the NOANSWER is to match diversion-reason from chan_sip, (which never reads PRIREDIRECTREASON) */
 				redirect_reason = 2;
 			else if (!strcasecmp(rr_str, "UNCONDITIONAL"))
 				redirect_reason = 15;

channels/chan_h323.c

@@ -626,7 +626,8 @@ static int oh323_call(struct ast_channel *c, char *dest, int timeout)
 			pvt->options.redirect_reason = 0;
 		else if (!strcasecmp(addr, "BUSY"))
 			pvt->options.redirect_reason = 1;
-		else if (!strcasecmp(addr, "NO_REPLY"))
+		else if (!strcasecmp(addr, "NO_REPLY") || !strcasecmp(addr, "NOANSWER"))
+		/* the NOANSWER is to match diversion-reason from chan_sip, (which never reads PRIREDIRECTREASON) */
 			pvt->options.redirect_reason = 2;
 		else if (!strcasecmp(addr, "UNCONDITIONAL"))
 			pvt->options.redirect_reason = 15;