Treat missing a=fmtp as defaults for AMR#2141
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Per RFC 4867 section 8.1, absent fmtp parameters imply defaults (bandwidth-efficient mode, no CRC, no robust-sorting, no interleaving). Previously, codec matching was rejected when either side had no ``a=fmtp`` attribute for the AMR payload type, causing AMR to be dropped as a "stray answer codec". This patch changes this behavior to instead "parse" fmtp even when absent so that the format struct is populated with zero-initialized defaults and fmtp_parsed is set.
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Per RFC 4867 section 8.1, absent fmtp parameters imply defaults (bandwidth-efficient mode, no CRC, no robust-sorting, no interleaving). Previously, codec matching was rejected when either side had no
a=fmtpattribute for the AMR payload type, causing AMR to be dropped as a "stray answer codec".This patch changes this behavior to instead "parse" fmtp even when absent so that the format struct is populated with zero-initialized defaults and fmtp_parsed is set.