witn SWISSQUAL , we hanve encountered several fail in call establishment and the message indicated by the tool in RR layer is :
Establishment cause: Originating call and TCH/F is needed, or originating call and the network does not set NECI bit to 1, or procedures that can be completed with a SDCCH and the network does not set NECI bit to 1
Random reference: 16
Can you help me to undersatand this message and the relation with NECI field(bit)???