[asterisk-bugs] [JIRA] (ASTERISK-25076) res_pjsip: Failover does not occur on connection-less transport or 503 response

[Rusty Newton (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-25076?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rusty Newton updated ASTERISK-25076:
------------------------------------

    Status: Open  (was: Triage)

> res_pjsip: Failover does not occur on connection-less transport or 503 response
> -------------------------------------------------------------------------------
>
>                 Key: ASTERISK-25076
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25076
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_pjsip
>    Affects Versions: 13.3.2
>            Reporter: Joshua Colp
>
> Page 9 of RFC3263 (SIP: Locating SIP Servers) describes when failover should occur when sending a request. It states:
> {noformat}
> For SIP requests, failure occurs if the transaction layer reports a
> 503 error response or a transport failure of some sort (generally,
> due to fatal ICMP errors in UDP or connection failures in TCP).
> Failure also occurs if the transaction layer times out without ever
> having received any response, provisional or final (i.e., timer B or
> timer F in RFC 3261 [1] fires).  If a failure occurs, the client
> SHOULD create a new request, which is identical to the previous, but
> has a different value of the Via branch ID than the previous (and
> therefore constitutes a new SIP transaction).  That request is sent
> to the next element in the list as specified by RFC 2782.
> {noformat}
> This does not currently occur for connectionless protocols or for 503 responses in the res_pjsip module or PJSIP itself.
> Note that this may include connection based protocols as well, but those have not yet been tested. This issue may be tweaked accordingly in the future.



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