AMR SID length?

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Max msuraev at sysmocom.de
Tue Jan 17 11:00:16 UTC 2017


Hi.

There seems to be a disagreement between Osmocom libraries as to which 
is the length of AMR SID RTP payload. According to libosmocodec it's 7 
bytes (see amr_len_by_ft in gsm690.c), according to libosmo-netif it's 6 
bytes (see amr_ft_to_bytes in amr.c). However, than I look at 3GPP TS 
26.101 Table 6 it seems like it should be 8 bytes.

Reading http://www.rfc-base.org/txt/rfc-4867.txt did not shed a light 
except that it can't be lower than 5 bytes.

Please help me out - what's the right number of bytes?

-- 
Max Suraev <msuraev at sysmocom.de> http://www.sysmocom.de/
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