[asterisk-bugs] [JIRA] Commented: (ASTERISK-20234) SRTP not working with some devices (Eg snom320) - Message "We are requesting SRTP for audio, but they responded without it!"

[Matt Jordan (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-20234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=196519#comment-196519 ] 

Matt Jordan commented on ASTERISK-20234:
----------------------------------------

Interestingly enough, the reason why this message is getting kicked back is because the phone isn't offering secure audio correctly.  The SDP offer provided by the SNOM 320 is offering unsecure audio:

{noformat}
m=audio 49152 RTP/AVP 9 0 8 3 99 108 18 101
{noformat}

The audio format offered by the phone should be "RTP/SAVP".

I'm fully willing to believe that this was not checked in a prior version of 1.8.  I'll have to look into how we want to handle this, since the phone itself is not compliant with RFC 4568.

> SRTP not working with some devices (Eg snom320) - Message "We are requesting SRTP for audio, but they responded without it!"
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-20234
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20234
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/SRTP
>    Affects Versions: 10.7.0
>         Environment: RHEL5 linux 2.6.18-308.11.1.el5
>            Reporter: tootai
>            Assignee: Rusty Newton
>         Attachments: asterisk-20234-sip.conf, full
>
>
> As you can see, snom 320 (latest stable firmware snom320-SIP 8.7.3.10) is annoncing crypto but asterisk doesn't recognize it.
> [Edit by Rusty Newton - removed debug excerpt since full log is now attached]
> And call is not accepted
> -- 
> Daniel

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