[asterisk-bugs] [JIRA] (ASTERISK-24387) res_pjsip: rport sent from UAS MUST include the port that the UAC sent the request on

[Matt Jordan (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-24387?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matt Jordan updated ASTERISK-24387:
-----------------------------------

    Status: Open  (was: Triage)

> res_pjsip: rport sent from UAS MUST include the port that the UAC sent the request on
> -------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-24387
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-24387
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_pjsip
>    Affects Versions: 12.6.0, 13.0.0-beta2
>            Reporter: Matt Jordan
>         Attachments: ASTERISK-24387-log.txt
>
>
> When {{force_rport=Yes}} and a request is received without an rport, Asterisk will respond with an {{rport}} parameter in the top-most {{Via}} header without a specified port. Arguably, every response from the UAS should specify the port with the {{rport}} parameter:
> {quote}
>  When a server compliant to this specification (which can be a proxy
>    or UAS) receives a request, it examines the topmost Via header field
>    value.  If this Via header field value contains an "rport" parameter
>    with no value, it MUST set the value of the parameter to the source
>    port of the request.
> {quote}
> Now, since there *was* no {{rport}} in the request, this is a bit murky. On the other hand, we probably should always provide the port with the {{rport}}, as this is more specific (and a bit more clear) than simply responding with {{rport}} and nothing else.
> A sample rejected call flow by the client is attached to the issue.



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