[asterisk-bugs] [JIRA] (ASTERISK-24449) Reinvite for T.38 UDPTL fails if SRTP is enabled

[Andreas Steinmetz (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-24449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andreas Steinmetz updated ASTERISK-24449:
-----------------------------------------

    Attachment: udptl-ignore-srtp-v2.patch

Version 2 of the patch, tighter check to prevent erroneous triggering.

> Reinvite for T.38 UDPTL fails if SRTP is enabled
> ------------------------------------------------
>
>                 Key: ASTERISK-24449
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-24449
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/T.38
>    Affects Versions: 11.13.0
>            Reporter: Andreas Steinmetz
>            Severity: Minor
>         Attachments: srtp-udptl.patch, udptl-ignore-srtp-v2.patch
>
>
> Asterisk does erroneously respect the SRTP setting for the SIP account when handling a reinvite for T.38 UDPTL.
> Furthermore there are ATAs like the Cisco SPA112 that, in a T.38 UDPTL reinvite response, send "a=crypto" lines which seems to be plain wrong.
> Quote from RFC4612:
> "Further, there are no procedures in place for encrypting and protecting the integrity ofthe UDPTL stream."
> Thus Asterisk needs to ignore anything related to SRTP when handling any T.38 UDPTL reinvite.



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