[asterisk-bugs] [JIRA] (ASTERISK-29183) Audio/Video Codecs: Format attributes get lost.

[Alexander Traud (JIRA)]

Alexander Traud created ASTERISK-29183:
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             Summary: Audio/Video Codecs: Format attributes get lost.
                 Key: ASTERISK-29183
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-29183
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: . I did not set the category correctly.
    Affects Versions: 18.1.0, 16.15.0
            Reporter: Alexander Traud


In June, a discussion started about a new, still upcoming Advanced Codec Negotiation (ACN; [mailing list|http://lists.digium.com/pipermail/asterisk-dev/2020-June/thread.html], [blog post|https://www.asterisk.org/asterisk-acn-advanced-codec-negotiation/], [wiki entry|https://wiki.asterisk.org/wiki/display/AST/PJSIP+Advanced+Codec+Negotiation]). Because I am leaving the Asterisk platform, just a note that Asterisk has not only problems with format negotiation but also preserving format attributes. Missing attributes heavily affect the overall negotiation, for example to get things working like in ASTERISK-29182 would not be possible at all.

Actually, I hacked format-attribute preserving into Asterisk years ago to get my AMR modules working. Although those hacks went into Asterisk, still scenarios exist which still loose the format attributes ([example|https://github.com/traud/asterisk-amr/issues/8#issuecomment-260714794]). Long story short: As of today, Asterisk was not designed to preserve format attributes in any bridge.



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