I was with GTPL from last 3 month. And I was using for office use. And internet connectivity fluctuations too much.
Speed is good when network live and if they can not make consistency then what will be the use of it.
Even you can not listen proper message from skype and can not convey your message. And customer raise the request and solve the request without otp. That the way they solve the problem just on assumtion
Reason I left that GTPL