Osmocom Libraries » libosmocore

The current implementation of gsm48_{en,de}code_bearer_cap() lacks support for:

• encoding/decoding V.34 modem type (octet 6d);
• encoding/decoding data rates higher than 9600 bps, like 14400 bps (octets 6d, 6e);
• encoding/decoding of other B-channel protocols like V.120 (octets 5a, 5b; see also #6330);
• encoding/decoding fields of octet 4 (hard-coded to 0x88).

Unfortunately, adding new fields to struct gsm_mncc_bearer_cap (on which these functions operate) is not an option.
This struct is part of the MNCC PDU, so changing it would result in modifying the protocol and thus problems with backwards compatibility.

This means that we need the new API, which would depend on the MNCC protocol definitions.