Index: asterisk/channels/chan_sip.c
===================================================================
RCS file: /usr/cvsroot/asterisk/channels/chan_sip.c,v
retrieving revision 1.661
diff -u -r1.661 chan_sip.c
--- asterisk/channels/chan_sip.c	14 Feb 2005 23:20:01 -0000	1.661
+++ asterisk/channels/chan_sip.c	16 Feb 2005 15:05:44 -0000
@@ -352,6 +352,7 @@
 	struct sip_route *route;		/* Head of linked list of routing steps (fm Record-Route) */
 	int route_persistant;			/* Is this the "real" route? */
 	char from[256];				/* The From: header */
+        char alertinfo[256];                   /* Alert-Info SIP header for distinctive ring */
 	char useragent[256];			/* User agent in SIP request */
 	char context[AST_MAX_EXTENSION];	/* Context for this call */
 	char fromdomain[AST_MAX_EXTENSION];	/* Domain to show in the from field */
@@ -2148,6 +2149,9 @@
 		if (!ast_strlen_zero(i->callid)) {
 			pbx_builtin_setvar_helper(tmp, "SIPCALLID", i->callid);
 		}
+		if (!ast_strlen_zero(i->alertinfo)) {
+		        pbx_builtin_setvar_helper(tmp, "SIPALERTINFO", i->alertinfo);
+		}
 		ast_setstate(tmp, state);
 		if (state != AST_STATE_DOWN) {
 			if (ast_pbx_start(tmp)) {
@@ -7880,6 +7884,7 @@
 	char *from;
 	char *e;
 	char *useragent;
+	char *alertinfo;
 	struct ast_channel *c=NULL;
 	struct ast_channel *transfer_to;
 	int seqno;
@@ -7918,6 +7923,9 @@
 	useragent = get_header(req, "User-Agent");
 	strncpy(p->useragent, useragent, sizeof(p->useragent)-1);
 
+	/* Save Alert-Info sent to us */
+	alertinfo = get_header(req, "Alert-Info");
+	strncpy(p->alertinfo, alertinfo, sizeof(p->alertinfo)-1);
 	
 	if (strcasecmp(cmd, "SIP/2.0")) {
 		/* Request coming in */			
Index: asterisk/doc/README.variables
===================================================================
RCS file: /usr/cvsroot/asterisk/doc/README.variables,v
retrieving revision 1.33
diff -u -r1.33 README.variables
--- asterisk/doc/README.variables	13 Feb 2005 20:57:52 -0000	1.33
+++ asterisk/doc/README.variables	16 Feb 2005 15:05:44 -0000
@@ -398,6 +398,7 @@
 ${SIPDOMAIN}    	SIP destination domain of an inbound call (if appropriate)
 ${SIPUSERAGENT} 	SIP user agent 
 ${SIPURI}		SIP uri
+${SIPALERTINFO}		SIP Alert-Info header for distinctive ring, received.
 
 The SIP channel reads the following variable:
 ${SIP_CODEC} 		Set the SIP codec for a call