[asterisk-bugs] [JIRA] (ASTERISK-30451) res_pjsip: Contact header set incorrectly for call redirect (302 Moved temp.) when external_* set

[Karsten Wemheuer (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-30451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=261697#comment-261697 ] 

Karsten Wemheuer commented on ASTERISK-30451:
---------------------------------------------

I have found a possible solution to the issue.
Unfortunately I have a problem with gerrit, so I attach the patch here.
The patch prevents NAT handling of the contact header when a 302 response message is sent.
As I understand the RFC, the Contact header is supposed to specify the new destination on a 302 response, so the destination is not local.

> res_pjsip: Contact header set incorrectly for call redirect (302 Moved temp.) when external_* set
> -------------------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-30451
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-30451
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_pjsip_nat
>    Affects Versions: 18.16.0
>         Environment: Debian 11 (Bullseye)
>            Reporter: Karsten Wemheuer
>         Attachments: pjsip.conf, trace-20230303-1.pcapng
>
>
> Hi, 
> I may have found a bug that occurs with a "redirect" (application "transfer").
> The scenario concerns a call that comes from the provider to the Asterisk and is to be routed in the dialplan via transfer to an external destination. the dialplan uses
> Transfer(sip:+491708300432 at tel.t-online.de)
> The resulting 302 response contains the IP address of the router in the Contact header. However, the provider expects the domain there.



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