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ARI/PJSIP: Add the ability to redirect (transfer) a channel in a Stasis app

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This patch adds a new feature to ARI to redirect a channel to another server,
and fixes a few bugs in PJSIP's handling of the Transfer dialplan
application/ARI redirect capability.

*New Feature*
A new operation has been added to the ARI channels resource, redirect. With
this, a channel in a Stasis application can be redirected to another endpoint
of the same underlying channel technology.

*Bug fixes*
In the process of writing this new feature, two bugs were fixed in the PJSIP
stack:
(1) The existing .transfer channel callback had the limitation that it could
    only transfer channels to a SIP URI, i.e., you had to pass
    'PJSIP/sip:foo@my_provider.com' to the dialplan application. While this is
    still supported, it is somewhat unintuitive - particularly in a world full
    of endpoints. As such, we now also support specifying the PJSIP endpoint to
    transfer to.
(2) res_pjsip_multihomed was, unfortunately, trying to 'help' a 302 redirect by
    updating its Contact header. Alas, that resulted in the forwarding
    destination set by the dialplan application/ARI resource/whatever being
    rewritten with very incorrect information. Hence, we now don't bother
    updating an outgoing response if it is a 302. Since this took a looong time
    to find, some additional debug statements have been added to those modules
    that update the Contact headers.

Review: https://reviewboard.asterisk.org/r/4316/

ASTERISK-24015 #close
Reported by: Private Name

ASTERISK-24703 #close
Reported by: Matt Jordan



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@431717 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Matthew Jordan
2015-02-12 20:32:48 +00:00
parent e8ec15a9ef
commit 1995baad71
11 changed files with 334 additions and 5 deletions
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32
res/stasis/control.c
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@@ -428,6 +428,38 @@ int stasis_app_control_continue(struct stasis_app_control *control, const char *
return 0;
}
static int app_control_redirect(struct stasis_app_control *control,
struct ast_channel *chan, void *data)
{
char *endpoint = data;
int res;
ast_assert(control->channel != NULL);
ast_assert(endpoint != NULL);
res = ast_transfer(control->channel, endpoint);
if (!res) {
ast_log(LOG_NOTICE, "Unsupported transfer requested on channel '%s'\n",
ast_channel_name(control->channel));
return 0;
}
return 0;
}
int stasis_app_control_redirect(struct stasis_app_control *control, const char *endpoint)
{
char *endpoint_data = ast_strdup(endpoint);
if (!endpoint_data) {
return -1;
}
stasis_app_send_command_async(control, app_control_redirect, endpoint_data, ast_free_ptr);
return 0;
}
struct stasis_app_control_dtmf_data {
int before;
int between;