[asterisk-bugs] [JIRA] (ASTERISK-23989) SDP offer/answer fails if crypto keys added to non-crypto offer

[Rusty Newton (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-23989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rusty Newton updated ASTERISK-23989:
------------------------------------

    Assignee: Olle Johansson  (was: Rusty Newton)
      Status: Waiting for Feedback  (was: Triage)

> SDP offer/answer fails if crypto keys added to non-crypto offer
> ---------------------------------------------------------------
>
>                 Key: ASTERISK-23989
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-23989
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/SRTP
>    Affects Versions: 1.8.28.2
>         Environment: Planet earth
>            Reporter: Olle Johansson
>            Assignee: Olle Johansson
>         Attachments: sdes-rtp-avp.diff
>
>
> 1) We got a new SNOM phone configured so it offered RTP/AVP but for some reason added a=crypto SDES keys. 
> 2) Microsoft Lync offers RTP/AVP and optional RTP/SAVP in the same SDP, also adding keys if RTP/SAVP is accepted
> Asterisk fails offer answer with the message:
> "We are requesting SRTP for audio, but they responded without it!"
> and sends 488. This error message is wrong and failing is wrong.
> We should ignore non-relevant attributes. If RTP/AVP is the offer, just don't check for the crypto keys and activate p->srtp.



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