[OpenSIPS-Users] 401 Unauthorized on BYE request

[Bogdan-Andrei Iancu]

Hi Andrey,

What you say is correct and unfortunately I have the trick here for you 
- indeed, the dialog structure is destroyed upon the first BYE (on its 
reply actually), so the second one will not match the dialog.... :-|

Maybe we can have a feature request to actually have the dialog 
destroyed with a bit of a delay (similar to the transactions), but this 
is not so easy to implement.

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
OpenSIPS Summit 27-30 Sept 2022, Athens
   https://www.opensips.org/events/Summit-2022Athens/

On 8/10/22 3:57 PM, Andrey F wrote:
> Hello team!
> Maybe anyone knows, is there a way to process a situation like this?
>
> Scheme:
> SIP Softphone A <-> OpenSIPS 3.1 <-> SIP Softphone B
>
> Steps:
> 1) SIP softphone B sent BYE request;
> 2) SIP softphone A receives BYE and tried to authorize it (sent 401 
> response);
> 3) SIP softphone B receives 401 and generates a new BYE with credentials;
> 4) OpenSIPS did not pass second BYE request, because dialog was 
> terminated on first BYE request.
>
> As far as I understand, SIP dialog on opensips is automatically 
> destroyed after the first BYE was received.
> From https://opensips.org/docs/modules/3.1.x/dialog.html 
> <https://opensips.org/docs/modules/3.1.x/dialog.html>:
>
>
>         1.2. How it works
>
>     ...
>     The dialog is automatically destroyed when a“BYE”is received. In
>     case of no“BYE”, the dialog lifetime is controlled via the default
>     timeout (see“default_timeout”-default_timeout
>     <https://opensips.org/docs/modules/3.1.x/dialog.html#param_default_timeout>)
>     and custom timeout (see“$DLG_timeout”-$DLG_timeout
>     <https://opensips.org/docs/modules/3.1.x/dialog.html#pv_DLG_timeout>).
>
>
>
> The second BYE witch credentials arrived to opensips very quickly 
> (just a few ms).
>
> My problem is that second BYE can not pass these procedures:
> 1) *if (topology_hiding_match())*
> 2)* if (t_check_trans())*
>
>
> On first BYE I see this in logs, it is matched.
> 1) *if (topology_hiding_match()) logs:
> *
>
>     DBG:dialog:api_match_dialog: We found DID param in R-URI with
>     value of XXXXXXXXX
>     DBG:dialog:dlg_onroute: route param is 'XXXXXXXXX' (len=12)
>     DBG:dialog:lookup_dlg: dialog id=1424242860 found on entry 3032
>     DBG:core:parse_headers: flags=58
>     DBG:core:parse_to_param: tag=YYYYYYY
>     DBG:core:parse_to_param: end of header reached, state=11
>     DBG:core:_parse_to: end of header reached, state=29
>     DBG:core:_parse_to: display={}, ruri={sip:1 at 1.1.1.1:1
>     <http://sip:1@1.1.1.1:1/>}
>     DBG:dialog:next_state_dlg: dialog 0x7f16b2b95cf8 changed from
>     state 4 to state 5, due event 7
>     DBG:dialog:init_dlg_term_reason: Setting DLG term reason to
>     [Upstream BYE]
>
>
> On second BYE I see this in logs, it is not matched.
> 2) *if (topology_hiding_match()) logs: *Dialog can not be matched
>
>     DBG:dialog:api_match_dialog: We found DID param in R-URI with
>     value of XXXXXXXXX
>     DBG:dialog:dlg_onroute: route param is 'XXXXXXXXX' (len=12)
>     DBG:dialog:lookup_dlg: no dialog id=1424242860 found on entry 3032
>     DBG:dialog:dlg_onroute: unable to find dialog for BYE with route
>     param 'XXXXXXXXX'
>     DBG:core:parse_headers: flags=58
>     DBG:core:parse_to_param: tag=TTTTTT
>     DBG:core:parse_to_param: end of header reached, state=11
>     DBG:core:_parse_to: end of header reached, state=29
>     DBG:core:_parse_to: display={}, ruri={sip:1 at 1.1.1.1:1
>     <http://sip:1@1.1.1.1:1/>}
>     DBG:dialog:get_dlg: input ci=<CCCCCCCCCCC>(37), tt=<TTTTTT>(15),
>     ft=<FFFFFFFFF>(14)
>     DBG:dialog:get_dlg: no dialog callid='CCCCCCCCCCC' found
>     DBG:dialog:dlg_onroute: Callid 'CCCCCCCCCCC' not found
>
> *
> *
> 3)* if (t_check_trans()) **logs:***transaction can not be matched
>
>     DBG:core:parse_headers: flags=78
>     DBG:tm:t_lookup_request: start searching: hash=44043, isACK=0
>     DBG:tm:matching_3261: RFC3261 transaction matching failed
>     DBG:tm:t_lookup_request: no transaction found
>     DBG:core:parse_headers: flags=ffffffffffffffff
>
>
> Finally, maybe anyone knows how to resolve this problem?
> Thank you!
>
> --
> Best regards,
> Andrey F
>
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