Hi I'm using 3CX free stable version with Grandstream HT-286 ATAs. Does 3CX handle the *xx feature codes (N. America)? or is it advised to enable the handling of call features on the ATAs themselves. Currently I have the handling of call features locally on the ATA off, and expected the 3CX to handle the processing of the * codes, but I always get a busy tone when trying to invoke the * codes. Anyone experienced this?