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

[Alexander Traud (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-29183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexander Traud updated ASTERISK-29183:
---------------------------------------

    Description: 
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 [SDP|https://tools.ietf.org/html/rfc4566] format parameters: {{a=fmtp …}}. Missing parameters 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-parameter 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 parameters ([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.

  was:
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.


> Audio/Video Codecs: Format parameters 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: 16.15.0, 18.1.0
>            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 [SDP|https://tools.ietf.org/html/rfc4566] format parameters: {{a=fmtp …}}. Missing parameters 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-parameter 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 parameters ([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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