Possible causes :
1. Channel type combination not supported or invalid data
rate;
2. or CIC is present for SDCCH connection;
3. or CIC is missing for a TCH connection;
4. or Cell identifier for target cell is not present for a Multicell
BSS;
5. or IE identifier is inconsistent (i.e. missing mandatory
field, Encryption Information, Classmark Information 1 or
2, or Cell Identifier (Serving cell));
6. or erroneous IE contents (Encryption Information);
7. or only one among OIEs “Group Call Reference” and
“Talker Flag” ist present