[asterisk-bugs] [JIRA] (ASTERISK-25160) [patch] Opus Codec: SIP/SDP line fmtp missing when called internally

[Alexander Traud (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-25160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=228271#comment-228271 ] 

Alexander Traud commented on ASTERISK-25160:
--------------------------------------------

Previously, this issue had as topic {{rtpmap}}. This was wrong. Not the {{rtpmap}} but {{fmtp}} is missing.

> [patch] Opus Codec: SIP/SDP line fmtp missing when called internally
> --------------------------------------------------------------------
>
>                 Key: ASTERISK-25160
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25160
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Channels/chan_sip/CodecHandling
>    Affects Versions: 13.6.0
>            Reporter: Alexander Traud
>            Severity: Minor
>         Attachments: A_generate_sdp_fmtp_always.patch, B_register_interface_with_cached.patch
>
>
> Sometimes, Asterisk does not send a line {{x=fmtp:y}} while negotiating the formats via SIP/SDP. This affects all formats with an attribute module like H.263, H.264, and Opus {{res/res_format_attr_opus.c}}.
> This happens, because {{ast_format_generate_sdp_fmtp}} is called with a format without an attribute module (variable {{interface}} is NULL). This happens, because such a format was created before its attribute module got registered. This happens for
> I) cached formats: main » ast_codec_builtin_init » CODEC_REGISTER_AND_CACHE » ast_format_create | ast_format_cache_set » set_cached_format
> II) local capabilities: main » ast_local_init » ast_format_cap_append_by_type » ast_format_create
> Steps to reproduce:
> # {{make install samples}}
> # edit the configuration file {{sip.conf}} to allow {{opus}}
> # dial echo-test extension (600)
> *Question to the Asterisk team:*
> Why are format-attribute modules loaded so late, after channels are loaded?



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