I am setting up my first 3CX. Everything is working except - I cannot seem to find the correct configuration to make outgoing calls through my Grandstream HT488. I have my calls setup with a prefix of "0", strip "1" digit and prepend "*00". - I am not getting an error through the voip client. - With a spy phone, I only hear the dial tone, no connection or attempt to dial out. - I can dial out with a phone connected to the HT488, when I dial *00. I have seen several posts about this. Has anyone found a solution? Thanks so much!