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- /*
- * Asterisk -- An open source telephony toolkit.
- *
- * Copyright (C) 2019, Alexei Gradinari
- *
- * Alexei Gradinari <alex2grad@gmail.com>
- *
- * 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 Attended transfer by caller channel
- *
- * \author Alexei Gradinari <alex2grad@gmail.com>
- *
- * \ingroup applications
- */
- /*** MODULEINFO
- <support_level>extended</support_level>
- ***/
- #include "asterisk.h"
- #include "asterisk/pbx.h"
- #include "asterisk/module.h"
- #include "asterisk/app.h"
- #include "asterisk/channel.h"
- #include "asterisk/bridge.h"
- #include "asterisk/features_config.h"
- /*** DOCUMENTATION
- <application name="AttendedTransfer" language="en_US">
- <synopsis>
- Attended transfer to the extension provided and TRANSFER_CONTEXT
- </synopsis>
- <syntax>
- <parameter name="exten" required="true">
- <para>Specify extension.</para>
- </parameter>
- </syntax>
- <description>
- <para>Queue up attended transfer to the specified extension in the <literal>TRANSFER_CONTEXT</literal>.</para>
- <para>Note that the attended transfer only work when two channels have answered and are bridged together.</para>
- <para>Make sure to set Attended Transfer DTMF feature <literal>atxfer</literal>
- and attended transfer is permitted.</para>
- <para>The result of the application will be reported in the <variable>ATTENDEDTRANSFERSTATUS</variable>
- channel variable:</para>
- <variablelist>
- <variable name="ATTENDEDTRANSFERSTATUS">
- <value name="SUCCESS">
- Transfer successfully queued.
- </value>
- <value name="FAILURE">
- Transfer failed.
- </value>
- <value name="NOTPERMITTED">
- Transfer not permitted.
- </value>
- </variable>
- </variablelist>
- </description>
- </application>
- ***/
- static const char * const app = "AttendedTransfer";
- static int attended_transfer_exec(struct ast_channel *chan, const char *data)
- {
- char *exten = NULL;
- const char *context = NULL;
- char *parse;
- AST_DECLARE_APP_ARGS(args,
- AST_APP_ARG(exten);
- );
- char feature_code[AST_FEATURE_MAX_LEN];
- const char *digit;
- struct ast_frame f = { .frametype = AST_FRAME_DTMF };
- if (ast_strlen_zero((char *)data)) {
- ast_log(LOG_WARNING, "%s requires an argument (exten)\n", app);
- pbx_builtin_setvar_helper(chan, "ATTENDEDTRANSFERSTATUS", "FAILURE");
- return 0;
- }
- context = pbx_builtin_getvar_helper(chan, "TRANSFER_CONTEXT");
- if (ast_strlen_zero(context)) {
- pbx_builtin_setvar_helper(chan, "ATTENDEDTRANSFERSTATUS", "NOTPERMITTED");
- return 0;
- }
- ast_channel_lock(chan);
- if (ast_get_builtin_feature(chan, "atxfer", feature_code, sizeof(feature_code)) ||
- ast_strlen_zero(feature_code)) {
- pbx_builtin_setvar_helper(chan, "ATTENDEDTRANSFERSTATUS", "NOTPERMITTED");
- ast_channel_unlock(chan);
- return 0;
- }
- ast_channel_unlock(chan);
- parse = ast_strdupa(data);
- AST_STANDARD_APP_ARGS(args, parse);
- exten = args.exten;
- for (digit = feature_code; *digit; ++digit) {
- f.subclass.integer = *digit;
- ast_queue_frame(chan, &f);
- }
- for (digit = exten; *digit; ++digit) {
- f.subclass.integer = *digit;
- ast_queue_frame(chan, &f);
- }
- f.subclass.integer = '#';
- ast_queue_frame(chan, &f);
- pbx_builtin_setvar_helper(chan, "ATTENDEDTRANSFERSTATUS", "SUCCESS");
- return 0;
- }
- static int unload_module(void)
- {
- return ast_unregister_application(app);
- }
- static int load_module(void)
- {
- return ast_register_application_xml(app, attended_transfer_exec);
- }
- AST_MODULE_INFO_STANDARD_EXTENDED(ASTERISK_GPL_KEY, "Attended transfer to the given extension");
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