[asterisk-bugs] [JIRA] (ASTERISK-24933) T38 fails negotiation

[Jonathan Rose (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-24933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Rose closed ASTERISK-24933.
------------------------------------


> T38 fails negotiation
> ---------------------
>
>                 Key: ASTERISK-24933
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-24933
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_pjsip, Resources/res_pjsip_t38
>    Affects Versions: SVN, 13.1.0, 13.4.0
>            Reporter: Jonathan Rose
>            Assignee: Jonathan Rose
>
> Reproduction:
> Two Asterisk boxes each have the other as endpoints with authentication set.
> First Asterisk box originates a call to the second using the PJSIP endpoint.
> The first Asterisk box uses an extension with sendfax, the second uses
> an extension with receivefax.
> The session starts fairly normally, but resolution never appears in fax show
> session output. After a while (~25 seconds) the call drops and the fax fails.
> Error messages shown are as follows:
> Sender: The call dropped prematurely
> Receiver: Disconnected after permitted retries
> Note that when not using authentication, the FAX will complete as expected.
> When using chan_sip as the sender to a receiver of chan_pjsip, the FAX will
> also complete as expected with authentication, but if chan_pjsip is the sender
> it will fail regardless of whether the recipient is chan_sip or chan_pjsip.
> The problem is caused by duplication of a framehook in res_pjsip_t38 which
> occurs on the second invite sent out when responding to the auth challenge.



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