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chan_dahdi/SS7: Made reject incoming call for an in-alarm or blocked channel.

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If a SS7 call comes in requesting a CIC that is in-alarm, the call is
accepted and connects if the extension exists in the dialplan.  The call
does not have any audio.

* Made release the call immediately with circuit congestion cause.

(closes issue ASTERISK-20204)
Reported by: Tuan Le
Patches:
      jira_asterisk_20204_v1.8.patch (license #5621) patch uploaded by rmudgett


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@376058 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2012-11-08 21:05:40 +00:00
parent df3fc95c4a
commit 6dbda720fc
1 changed files with 28 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

49
channels/sig_ss7.c
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@@ -279,6 +279,24 @@ static void sig_ss7_handle_link_exception(struct sig_ss7_linkset *linkset, int w
}
}
/*!
* \internal
* \brief Determine if a private channel structure is available.
*
* \param pvt Channel to determine if available.
*
* \return TRUE if the channel is available.
*/
static int sig_ss7_is_chan_available(struct sig_ss7_chan *pvt)
{
if (!pvt->inalarm && !pvt->owner && !pvt->ss7call
&& pvt->call_level == SIG_SS7_CALL_LEVEL_IDLE
&& !pvt->locallyblocked && !pvt->remotelyblocked) {
return 1;
}
return 0;
}
/*!
* \internal
* \brief Obtain the sig_ss7 owner channel lock if the owner exists.
@@ -547,7 +565,7 @@ static void ss7_start_call(struct sig_ss7_chan *p, struct sig_ss7_linkset *links
ast_log(LOG_WARNING, "Unable to start PBX on CIC %d\n", p->cic);
ast_mutex_lock(&linkset->lock);
sig_ss7_lock_private(p);
isup_rel(linkset->ss7, p->ss7call, -1);
isup_rel(linkset->ss7, p->ss7call, AST_CAUSE_SWITCH_CONGESTION);
p->call_level = SIG_SS7_CALL_LEVEL_IDLE;
p->alreadyhungup = 1;
return;
@@ -894,11 +912,11 @@ void *ss7_linkset(void *data)
* We have not sent our IAM yet and we never will at this point.
*/
p->alreadyhungup = 1;
isup_rel(ss7, e->iam.call, -1);
isup_rel(ss7, e->iam.call, AST_CAUSE_NORMAL_CIRCUIT_CONGESTION);
}
p->call_level = SIG_SS7_CALL_LEVEL_GLARE;
if (p->owner) {
p->owner->hangupcause = AST_CAUSE_NORMAL_CLEARING;
p->owner->hangupcause = AST_CAUSE_NORMAL_CIRCUIT_CONGESTION;
ast_softhangup_nolock(p->owner, AST_SOFTHANGUP_DEV);
ast_channel_unlock(p->owner);
}
@@ -911,6 +929,13 @@ void *ss7_linkset(void *data)
*/
ast_assert(!p->owner);
if (!sig_ss7_is_chan_available(p)) {
/* Circuit is likely blocked or in alarm. */
isup_rel(ss7, e->iam.call, AST_CAUSE_NORMAL_CIRCUIT_CONGESTION);
sig_ss7_unlock_private(p);
break;
}
/* Mark channel as in use so no outgoing call will steal it. */
p->call_level = SIG_SS7_CALL_LEVEL_ALLOCATED;
p->ss7call = e->iam.call;
@@ -1349,24 +1374,6 @@ int sig_ss7_add_sigchan(struct sig_ss7_linkset *linkset, int which, int ss7type,
return 0;
}
/*!
* \internal
* \brief Determine if a private channel structure is available.
*
* \param pvt Channel to determine if available.
*
* \return TRUE if the channel is available.
*/
static int sig_ss7_is_chan_available(struct sig_ss7_chan *pvt)
{
if (!pvt->inalarm && !pvt->owner && !pvt->ss7call
&& pvt->call_level == SIG_SS7_CALL_LEVEL_IDLE
&& !pvt->locallyblocked && !pvt->remotelyblocked) {
return 1;
}
return 0;
}
/*!
* \brief Determine if the specified channel is available for an outgoing call.
* \since 1.8