i have a connex 3300 and it has no talkback.why?this one has the ept360014c board...not the ever popular 360014b ......as far as i can tell everything is hooked up right and not missing .i looked everything over that would be disconnected if the talkback had been disabled and it hasnt been disabled from what i can see.what are some things i could check on this board to see why i have no talkback?there was even the galaxy talkback mod in it (on the solder side where you jump a resistor across )and thats not working either .any help would be great.this should have had talkback when you turn the echo on i assume?