Cellular Network Infrastructure » Core Network (CN) » OsmoMSC

While investigating #6216, I noticed that the Bearer Capability in MT SETUP looks weird and does not match such in the MO SETUP.

[frame 9] MO Setup (from SE K800):

    Bearer Capability 1 - (MS supports at least full rate speech version 1 and half rate speech version 1. MS has a greater preference for full rate speech version 1 than for half rate speech version 1)
        Element ID: 0x04
        Length: 6
        Octet 3
            0... .... = Extension: Extended
            .11. .... = Radio channel requirement: MS supports at least full rate speech version 1 and half rate speech version 1. MS has a greater preference for full rate speech version 1 than for half rate speech version 1
            ...0 .... = Coding standard: GSM standardized coding
            .... 0... = Transfer mode: circuit
            .... .000 = Information transfer capability: Speech (0x0)
        Octets 3a - Speech Versions
            0... .... = Extension: Extended
            .0.. .... = Coding: octet used for extension of information transfer capability
            ..00 .... = Spare bit(s): 0
            .... 0100 = Speech version indication: GSM full rate speech version 3(FR AMR) (0x4)
            0... .... = Extension: Extended
            .0.. .... = Coding: octet used for extension of information transfer capability
            ..00 .... = Spare bit(s): 0
            .... 0010 = Speech version indication: GSM full rate speech version 2(GSM EFR) (0x2)
            0... .... = Extension: Extended
            .0.. .... = Coding: octet used for extension of information transfer capability
            ..00 .... = Spare bit(s): 0
            .... 0000 = Speech version indication: GSM full rate speech version 1(GSM FR) (0x0)
            0... .... = Extension: Extended
            .0.. .... = Coding: octet used for extension of information transfer capability
            ..00 .... = Spare bit(s): 0
            .... 0101 = Speech version indication: GSM half rate speech version 3(HR AMR) (0x5)
            1... .... = Extension: No Extension
            .0.. .... = Coding: octet used for extension of information transfer capability
            ..00 .... = Spare bit(s): 0
            .... 0001 = Speech version indication: GSM half rate speech version 1(GSM HR) (0x1)

[frame 22] MT Setup (from osmo-msc):

    Bearer Capability 1 - (MS supports at least full rate speech version 1 and half rate speech version 1. MS has a greater preference for full rate speech version 1 than for half rate speech version 1)
        Element ID: 0x04
        Length: 5
        Octet 3
            0... .... = Extension: Extended
            .11. .... = Radio channel requirement: MS supports at least full rate speech version 1 and half rate speech version 1. MS has a greater preference for full rate speech version 1 than for half rate speech version 1
            ...0 .... = Coding standard: GSM standardized coding
            .... 0... = Transfer mode: circuit
            .... .000 = Information transfer capability: Speech (0x0)
        Octets 3a - Speech Versions
            0... .... = Extension: Extended
            .0.. .... = Coding: octet used for extension of information transfer capability
            ..00 .... = Spare bit(s): 0
            .... 0100 = Speech version indication: GSM full rate speech version 3(FR AMR) (0x4)
            0... .... = Extension: Extended
            .0.. .... = Coding: octet used for extension of information transfer capability
            ..00 .... = Spare bit(s): 0
            .... 0101 = Speech version indication: GSM half rate speech version 3(HR AMR) (0x5)
            0... .... = Extension: Extended
            .0.. .... = Coding: octet used for extension of information transfer capability
            ..00 .... = Spare bit(s): 0
            .... 1011 = Speech version indication: GSM half rate speech version 6(OHR AMR) (0xb)
            1... .... = Extension: No Extension
            .0.. .... = Coding: octet used for extension of information transfer capability
            ..00 .... = Spare bit(s): 0
            .... 0000 = Speech version indication: GSM full rate speech version 1(GSM FR) (0x0)

osmo-msc.git 1792ba92c1f939fb232e25ae1124eda7bb11983f (1.11.1)
libosmocore.git 435856be518c9d3531ae5b8cbadac1474d521f3a