[sr-dev] [kamailio/kamailio] Kamailio 5.1.8, error in sdpops, sdp_keep_codecs function (#1983)
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Fri Feb 28 18:56:32 CET 2020
I looked into the SDPops module and also the SDP core parser. Furthermore I read the relevant RFCs more closely.
It seems that this particular situation (having two ftmp for one media/codec) is not valid.
> RFC 4566:
> 6. SDP Attributes
> a=fmtp:<format> <format specific parameters>
> This attribute allows parameters that are specific to a
> particular format to be conveyed in a way that SDP does not
> have to understand them. The format must be one of the formats
> specified for the media. Format-specific parameters may be any
> set of parameters required to be conveyed by SDP and given
> unchanged to the media tool that will use this format. At most
> one instance of this attribute is allowed for each format.
> RFC 5939:
> 3.13.1. The "rtpmap" and "fmtp" Attributes
> An "fmtp" attribute capability in a
> potential configuration for a media format that already has an "fmtp"
> attribute in the actual configuration may lead to multiple fmtp
> format parameters for that media format and that is not allowed by
> SDP [RFC4566]. The delete-attributes MUST be used to ensure that
> there are not multiple "fmtp" attributes for a given media format in
> a media description.
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