1)What is exchanged between VLR_HLR on D interface i.e MAP-D?
2)In 3G networks there is absence of Gs interface between SGSN and MSC allowing simultaneous circuit switching voice call and GPRS.However in 2G this is not allowed.Could anybody let me know the the signalling procedures enhance in 3G agains 2G which does not support simultaneous voice/data calls?
Regards
Ranjeet
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