diff -ur asterisk-1.0.1.old/channels/chan_sip.c asterisk-1.0.1/channels/chan_sip.c
--- asterisk-1.0.1.old/channels/chan_sip.c	2004-09-28 05:55:08.000000000 -0700
+++ asterisk-1.0.1/channels/chan_sip.c	2004-10-05 19:38:35.000000000 -0700
@@ -3937,8 +3937,8 @@
 	add_header(&req, "Event", "message-summary");
 	add_header(&req, "Content-Type", notifymime);
 
-	snprintf(tmp, sizeof(tmp), "Messages-Waiting: %s\n", newmsgs ? "yes" : "no");
-	snprintf(tmp2, sizeof(tmp2), "Voicemail: %d/%d\n", newmsgs, oldmsgs);
+	snprintf(tmp, sizeof(tmp), "Messages-Waiting: %s\r\n", newmsgs ? "yes" : "no");
+	snprintf(tmp2, sizeof(tmp2), "Voicemail: %d/%d\r\n", newmsgs, oldmsgs);
 	snprintf(clen, sizeof(clen), "%d", (int)(strlen(tmp) + strlen(tmp2)));
 	add_header(&req, "Content-Length", clen);
 	add_line(&req, tmp);