PHP versions 4 and 5
NET_SMPP_MIG_OPERATOR_3 = 'MIG01HU'
NET_SMPP_MIG_OPERATOR_O2 = 'MIG01XU'
NET_SMPP_MIG_OPERATOR_ORANGE = 'MIG01OU'
NET_SMPP_MIG_OPERATOR_TMOB = 'MIG01TU'
NET_SMPP_MIG_OPERATOR_VODA = 'MIG67VU'