diff -Nurp -x .svn a/channels/chan_sip.c b/channels/chan_sip.c
--- a/channels/chan_sip.c	2009-09-23 21:02:15.506767848 -0400
+++ b/channels/chan_sip.c	2009-09-23 21:04:47.544828383 -0400
@@ -23947,13 +23947,12 @@ static struct sip_auth *add_realm_authen
 	}
 	stringp = username;
 	username = strsep(&stringp, ":");
-	if (username) {
-		secret = strsep(&stringp, ":");
+	secret = stringp;
 		if (!secret) {
 			stringp = username;
-			md5secret = strsep(&stringp, "#");
+			username = strsep(&stringp, "#");
+			md5secret = stringp;
 		}
-	}
 	if (!(auth = ast_calloc(1, sizeof(*auth))))
 		return authlist;