Section: 10.5.4.4a.1 Static conditions for the backup bearer capability IE contents
Content: If the information transfer capability field (octet 3) indicates "speech", octets 4, 5, 5a, 5b, 6, 6a, 6b, 6c, 6d, 6e, 6f, 6g and 7 shall not be included. If the information transfer capability field (octet 3) indicates a value different from "speech", octets 4 and 5shall be included, octets 6, 6a, 6b, 6c, 6d, 6e, 6f and 6g are optional. In case octet 6 is included, octets 6a, 6b, and 6c shall also be included. In case octet 6d is included, octets 6e, 6f and 6g may be included. If the information transfer capability field (octet 3) indicates "facsimile group 3" and octet 6c is included, the modem type field (octet 6c) shall indicate "none". If the information transfer capability field (octet 3) indicates "other ITC" or the rate adaption field (octet 5) indicates "other rate adaption", octet 5a shall be included. The modem type field (octet 6c) shall not indicate "autobauding type 1" unless the connection element field (octet 6c) indicates "non transparent".