[asterisk-bugs] [JIRA] (ASTERISK-20835) RTP not modified when UAS responds with an OK(200) with other ptime then 20ms

[Paolo Compagnini (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-20835?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paolo Compagnini updated ASTERISK-20835:
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    Attachment: extensions.conf
    
> RTP not modified when UAS responds with an OK(200) with other ptime then 20ms
> -----------------------------------------------------------------------------
>
>                 Key: ASTERISK-20835
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-20835
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>    Affects Versions: 10.11.0
>            Reporter: Paolo Compagnini
>            Assignee: Paolo Compagnini
>            Severity: Minor
>         Attachments: debug, extensions.conf, sip_and_rtp.pcap, sip.conf
>
>
> my Asterisk 10 svn recievs an INVITE from A with ptime:20 and invites B also with ptime:20.
> now B sends an OK with ptime:30. The OK from Asterisk to A contains ptime:20.
> But now the RTP stream from asterisk to A is the same as from B to asterisk. That means asterisk doesn't change the stream ( 20 40 20 40 20 40 )and is transmitting with a ptime of 30ms (30 30 30 30 30 ).
> regarding the RFC this shouldn't be an issiue since RFC4566 says:"
>  It should not be necessary to know ptime to decode RTP
>          or vat audio, and it is intended as a recommendation for the
>          encoding/packetisation of audio."
> but this can lead to strange behaviour of A like synchronisations problems.

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