أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
1- e-supportb.
2- first call resolutionc.
2- automatic repeat requestd.
3- Quality of Service.
I agree with experts answer. Thanks for the invitation. .
Thanks invite. ........ I agree answer Omar Saad Ibrahem
Thanks invite. ......... I leaveanswer Experts
Thnaks
I think , it is Quality of Service
3- Quality of Service..............................................
I apologize for the answer I leave the answer to the experts, specialists in this field that's not my area I wish you only invite specialists only