Fix parsing of IPv6 address literals in outboundproxy

(closes issue #17757)
Reported by: oej
Patches:
      17757.diff uploaded by sperreault (license 252)
      sip.conf.diff uploaded by sperreault (license 252)
Tested by: oej


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@281687 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/netsock2.h

@@ -229,6 +229,26 @@ static inline char *ast_sockaddr_stringify_port(const struct ast_sockaddr *addr)
 	return ast_sockaddr_stringify_fmt(addr, AST_SOCKADDR_STR_PORT);
 }
 
+/*!
+ * \since 1.8
+ *
+ * \brief
+ * Splits a string into its host and port components
+ *
+ * \param str[in]   The string to parse. May be modified by writing a NUL at the end of
+ *                  the host part.
+ * \param host[out] Pointer to the host component within \a str.
+ * \param port[out] Pointer to the port component within \a str.
+ * \param flags     If set to zero, a port MAY be present. If set to PARSE_PORT_IGNORE, a
+ *                  port MAY be present but will be ignored. If set to PARSE_PORT_REQUIRE,
+ *                  a port MUST be present. If set to PARSE_PORT_FORBID, a port MUST NOT
+ *                  be present.
+ *
+ * \retval 1 Success
+ * \retval 0 Failure
+ */
+int ast_sockaddr_split_hostport(char *str, char **host, char **port, int flags);
+
 /*!
  * \since 1.8
  *