Make all of the various rtpqos parameters in this branch available from the CHANNEL function.

Also includes a test for retrieving rtpqos parameters, including a NULL RTP
driver.  Additionally, some further separation of the SIP internal API into
headers was necessary.

(closes issue #16652)
 Reported by: kkm
 Patches: 
       20100204__issue16652.diff.txt uploaded by tilghman (license 14)
 
Review: https://reviewboard.asterisk.org/r/501/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@247124 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/sip/include/globals.h

@@ -0,0 +1,42 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2010, Digium, Inc.
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*!
+ * \file
+ * \brief sip global declaration header file
+ */
+
+#include "sip.h"
+
+#ifndef _SIP_GLOBALS_H
+#define _SIP_GLOBALS_H
+
+extern struct sockaddr_in bindaddr;     /*!< UDP: The address we bind to */
+extern struct sched_context *sched;     /*!< The scheduling context */
+
+/*! \brief Definition of this channel for PBX channel registration */
+extern const struct ast_channel_tech sip_tech;
+
+/*! \brief This version of the sip channel tech has no send_digit_begin
+ * callback so that the core knows that the channel does not want
+ * DTMF BEGIN frames.
+ * The struct is initialized just before registering the channel driver,
+ * and is for use with channels using SIP INFO DTMF.
+ */
+extern struct ast_channel_tech sip_tech_info;
+
+#endif /* !defined(SIP_GLOBALS_H) */
+