13th February 2010 at 07:16
#61037
Mahesh Kumar Singh
Guest
This is happening becuase of there is possibilities that EFR is used and threshold value is set in such manner that if there is low call volume then call is opted to switched in EFR.EFR provide better quality and SQI as compare to AMR.This is realy a good feature that during low call volume all call is initiated in EFR.