--- chan_sip.c-orig	2013-11-25 10:34:36.718954174 +0100
+++ chan_sip.c	2013-11-25 11:42:19.638105461 +0100
@@ -30175,7 +30175,7 @@
 	username = authcopy;
 
 	/* split user[:secret] and relm */
-	realm = strrchr(username, '@');
+	realm = strchr(username, '@');
 	if (realm)
 		*realm++ = '\0';
 	if (ast_strlen_zero(username) || ast_strlen_zero(realm)) {