[asterisk-bugs] [JIRA] (ASTERISK-27179) res_pjsip_session: Handling of 'msid' is incorrect

[Kevin Harwell (JIRA)]

Kevin Harwell created ASTERISK-27179:
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             Summary: res_pjsip_session: Handling of 'msid' is incorrect
                 Key: ASTERISK-27179
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27179
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_pjsip_sdp_rtp, Resources/res_pjsip_session
    Affects Versions: GIT, 15.0.0-beta1
            Reporter: Kevin Harwell


The current handling of the msid attribute is not quite right. According to the spec[1] the msid's between the offer/answer are not dependent upon one another. Meaning the same msid's given in an offer do not have to returned in the answer for a given stream. Actually it's probably better if they are not copied/reused since this can potentially cause some browser side confusion.

Instead Asterisk should always just generate new msids. When doing this we should also pair audio+video streams together when we can, i.e. sharing the same stream but different tracks.

[1] https://www.ietf.org/id/draft-ietf-mmusic-msid-16.txt





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