witn SWISSQUAL , we hanve encountered several fail in call establishment and the message indicated by the tool in RR layer is :
Channel Request
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)???
NECI when set to 1, it informs Mobile that the area supports Half-rate TCH, when it is set to 0, It indicates half-rate TCH is not supported by the system.
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