| Summary: | ASTERISK-25034: chan_dahdi: Some telco switches occasionally ignore ISDN RESTART requests. | ||||
| Reporter: | Richard Mudgett (rmudgett) | Labels: | |||
| Date Opened: | 2015-04-29 13:35:41 | Date Closed: | 2015-04-30 11:12:15 | ||
| Priority: | Major | Regression? | |||
| Status: | Closed/Complete | Components: | Channels/chan_dahdi | ||
| Versions: | 11.17.1 13.3.2 | Frequency of Occurrence | Occasional | ||
| Related Issues: |
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| Environment: | Attachments: | ||||
| Description: | The fix for ASTERISK-19608 added an escape clause for B channels in the restarting state if the telco ignores a RESTART request. If the telco fails to acknowledge the RESTART then Asterisk will assume the telco acknowledged the RESTART on the second call attempt requesting the B channel by the telco. The escape clause is good for dealing with RESTART requests in general but it does cause the next call for the restarting B channel to be rejected if the telco insists the call must go on that B channel.
chan_dahdi doesn't really need to issue a RESTART request in response to receiving a cause 44 (Requested channel not available). Sending the RESTART in such a situation is not required (nor prohibited) by the standards. I think chan_dahdi does this for historical reasons to deal with buggy peers to get channels unstuck in a similar fashion as the chan_dahdi.conf resetinterval option. This issue proposes to add a chan_dahdi.conf force_restart_unavailable_chans compatability option that when disabled will prevent chan_dahdi from trying to RESTART the channel in response to a cause 44 code. | ||||
| Comments: | By: Richard Mudgett (rmudgett) 2015-04-29 18:19:47.326-0500 Patches up on gerrit: v11 https://gerrit.asterisk.org/#/c/303/ v13 https://gerrit.asterisk.org/#/c/304/ master https://gerrit.asterisk.org/#/c/305/ | ||||