[asterisk-bugs] [JIRA] (ASTERISK-21150) UDPTL Error Correction Scheme Negotiation Issue, Asterisk copies the Error Correction Scheme from T38 offer from remote peer even if UDPTL error correction scheme is set to NONE for that peer in sip.conf

[NITESH BANSAL (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-21150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

NITESH BANSAL updated ASTERISK-21150:
-------------------------------------

    Attachment:     (was: do-not-use-ec-from-offer-if-configured-ec-is-none.patch)
    
> UDPTL Error Correction Scheme Negotiation Issue, Asterisk copies the Error Correction Scheme from T38 offer from remote peer even if UDPTL error correction scheme is set to NONE for that peer in sip.conf
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-21150
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21150
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/T.38
>    Affects Versions: 11.4.0
>         Environment: x86_64 Debian Squeeze Distro
>            Reporter: NITESH BANSAL
>            Assignee: Jonathan Rose
>            Severity: Minor
>         Attachments: do-not-use-ec-from-offer-if-configured-ec-is-none.patch
>
>
> Scenario: Asterisk receives a T38 invite which proposes some error correction scheme, Asterisk copies the error correction scheme from the offer and puts it in 200 OK. This behaviour does not change even if UDPTL error correction scheme is set to NONE for this peer.
> Expected Output: Asterisk should respond with no error correction scheme if this peer has t38_udptl error correction scheme set to NONE.
> Below is the reference from T38 spec:
> """"T38FaxUdpEC is negotiated only when using UDPTL as the transport. This parameter can have
> one of three values (see also Table D.2): t38UDPNoEC, t38UDPRedundancy, or t38UDPFEC. If
> the answering endpoint supports the offered error correction mode, then it shall return the same
> value in the answer, otherwise a different value shall be returned""""

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