Hello,
information available on channels involved in attended transfer is
inadequate for my purposes, so I have created a function which sets some
variables on these channels, and also runs transferee and transfer
target through dialplan. It works, but I am unsure that I did it
correctly. Two specific questions of note:
1. Do I have to lock channels before setting variables? I've seen it
done in many places, but if I do, I get debug messages like: "Thread LWP
822 is blocking 'PJSIP/444-0000004b', already blocked by thread LWP 6204
in procedure ast_waitfor_nandfds".
2. Do I have to set autoservice_chan parameter in ast_app_exec_sub? I
don't know what autoservice is.
The function follows (I call it from two_bridge_attended_transfer and
ast_bridge_transfer_attended functions).
/*!
* \internal
* \brief Set variables on channels involved in attended transfer and
run them through dialplan.
*
* \param to_transferee The channel that is bridged to the transferee
* \param to_transfer_target The channel that dialed the transfer target(s)
* \param transferee_channels A two-channel container containing the
transferer and transferee
* \param to_target_bridge The bridge between to_transfer_target and
the transfer_target (NULL if transfer_target did not answer yet)
*
* \retval 0 on success.
* \retval -1 on error.
*/
static int ast_bridge_transfer_attended_to_dialplan(struct ast_channel
*to_transferee,
struct ast_channel *to_transfer_target,
struct ao2_container *transferee_channels, struct ast_bridge
*to_target_bridge)
{
RAII_VAR(struct ao2_container *, target_channels, NULL, ao2_cleanup);
RAII_VAR(struct ast_channel *, transferee, NULL, ao2_cleanup);
RAII_VAR(struct ast_channel *, transfer_target, NULL, ao2_cleanup);
const char *to_transferee_name;
const char *to_transfer_target_name;
const char *transferee_name;
const char *dialed_channels;
transferee = get_transferee(transferee_channels, to_transferee);
if (!transferee)
return -1;
if (to_target_bridge) {
target_channels = ast_bridge_peers_nolock(to_target_bridge);
if (!target_channels)
return -1;
transfer_target = get_transferee(target_channels,
to_transfer_target);
} else {
transfer_target = NULL;
}
to_transferee_name = ast_strdupa(ast_channel_name(to_transferee));
to_transfer_target_name =
ast_strdupa(ast_channel_name(to_transfer_target));
transferee_name = ast_strdupa(ast_channel_name(transferee));
dialed_channels = pbx_builtin_getvar_helper(to_transfer_target,
"DIALEDCHANNELS");
pbx_builtin_setvar_helper(to_transferee, ATTENDEDTRANSFERER1,
to_transferee_name);
pbx_builtin_setvar_helper(to_transferee, ATTENDEDTRANSFERER2,
to_transfer_target_name);
pbx_builtin_setvar_helper(to_transfer_target, ATTENDEDTRANSFERER1,
to_transferee_name);
pbx_builtin_setvar_helper(to_transfer_target, ATTENDEDTRANSFERER2,
to_transfer_target_name);
pbx_builtin_setvar_helper(transferee, ATTENDEDTRANSFERER1,
to_transferee_name);
pbx_builtin_setvar_helper(transferee, ATTENDEDTRANSFERER2,
to_transfer_target_name);
ast_app_exec_sub(NULL, transferee,
"attended_transferee_connect,s,1", 0);
if (transfer_target) {
pbx_builtin_setvar_helper(transfer_target, ATTENDEDTRANSFEREE,
transferee_name);
pbx_builtin_setvar_helper(transfer_target, ATTENDEDTRANSFERER1,
to_transferee_name);
pbx_builtin_setvar_helper(transfer_target, ATTENDEDTRANSFERER2,
to_transfer_target_name);
ast_app_exec_sub(NULL, transfer_target,
"attended_target_connect,s,1", 0);
} else {
if (!ast_strlen_zero(dialed_channels)) {
char *b_channel_names = ast_strdupa(dialed_channels);
char *b_channel_name;
while ((b_channel_name = strtok_r(b_channel_names, " ",
&b_channel_names))) {
struct ast_channel *b_channel =
ast_channel_get_by_name(b_channel_name);
if (b_channel) {
pbx_builtin_setvar_helper(b_channel,
ATTENDEDTRANSFEREE, transferee_name);
pbx_builtin_setvar_helper(b_channel,
ATTENDEDTRANSFERER1, to_transferee_name);
pbx_builtin_setvar_helper(b_channel,
ATTENDEDTRANSFERER2, to_transfer_target_name);
ast_app_exec_sub(NULL, b_channel,
"attended_target_connect,s,1", 0);
ast_channel_unref(b_channel);
}
}
}
}
return 0;
}
--
Nikša Baldun
--
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