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Themyscira Wireless Technical Specification TW-TS-001 defines an enhanced RTP transport format for FR and EFR codecs within an IP-based GSM RAN, restoring the full functionality and semantics of GSM 08.60 TRAU-UL format that were lost in the industry transition to RTP with payload formats standardized by TIPHON and IETF. Given that this new enhanced RTP transport format runs counter to commonly accepted standards, it is strictly optional. OsmoBTS always accepts both basic and extended RTP formats, but it sends the extended RTP format of TW-TS-001 only when commanded to do so by the BSC via an RSL extension IE; OsmoBSC will in turn direct the BTS to use this extension only when the CN asks for it via the BSSMAP extension defined in TW-TS-003. Spec references: https://www.freecalypso.org/specs/tw-ts-001-v010100.txt https://www.freecalypso.org/specs/tw-ts-003-v010002.txt Related: OS#6448 Depends: I0eccfe5ddcf44f8f20440acb01e2d4870ec0cd91 (libosmocore) Change-Id: Id997e8666bc19e60936aaa83b43a968d30320bd7