--- main/rtp_engine.c (Asterisk 13.19) +++ main/rtp_engine.c (working copy) @@ -2345,10 +2345,14 @@ int ast_rtp_engine_load_format(struct ast_format *format) { + char *codec_name = ast_strdupa(ast_format_get_codec_name(format)); + + codec_name = ast_str_to_upper(codec_name); + set_next_mime_type(format, 0, ast_codec_media_type2str(ast_format_get_type(format)), - ast_format_get_codec_name(format), + codec_name, ast_format_get_sample_rate(format)); add_static_payload(-1, format, 0);