diff -u asterisk-1.8.3.2/main/netsock2.c.orig asterisk-1.8.3.2/main/netsock2.c
--- asterisk-1.8.3.2/main/netsock2.c.orig       2010-10-18 21:50:04.000000000 +0200
+++ asterisk-1.8.3.2/main/netsock2.c    2011-04-19 12:08:51.000000000 +0200
@@ -94,6 +94,18 @@
                ast_log(LOG_ERROR, "getnameinfo(): %s\n", gai_strerror(e));
                return "";
        }
+
+       /*
+        * Remove scope ID (interface name on Linux) from IPv6 link local addresses, so
+        * to comply to IPv6address BNF in RFC 3261. Section 25.1.
+        */
+       if (ast_sockaddr_is_ipv6(sa) &&
+                 IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)sa)->sin6_addr))) {
+               char *p = strchr(host, '%');
+               if (NULL != p) {
+                       *p = '\0';
+               }
+       }

        switch (format)  {
        case AST_SOCKADDR_STR_DEFAULT: