A SFO ACR PUSH BACK CREW DID NOT MAINTAIN COMMUNICATIONS WITH THE CAPT DURING PUSH BACK AFTER BEING TOLD TO REMAIN CLEAR OF TXWY.

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READY FOR PUSHBACK AT SFO GATE. THE TUG DRIVER CHKED IN AND INFORMED US HE WAS READY. I REPLIED WE WOULD CALL GND FOR CLRNC; AS IT IS NECESSARY TO PUSH OUT OF OUR ALLEY AND ONTO TXWY A. GND CLRED US TO PUSH INTO THE ALLEY; BUT HOLD SHORT OF TXWY A. I HAD TO SOUND A GND HORN TO GET THE TUG DRIVER'S ATTN; TO RELAY THE INSTRUCTIONS. HE BEGAN THE PUSH. THE TUG ONLY PUSHED US OUT OF THE GATE WHICH IS FAR FROM TXWY A; SO AGAIN I HAD TO SOUND A HORN TO GET HIS DIRECTION AND REPEATED TO HIM TO PUSH BACK; BUT HOLD SHORT OF TXWY A. I ALSO ASKED HIM WHY I HAD TO SOUND THE HORN EVERY TIME I NEEDED TO SPEAK TO HIM; AND HE BLAMED HIS HEADSET; WHICH MADE NO SENSE AS WE COULD TALK EVERY TIME I SOUNDED THE HORN. AS WE PUSHED TOWARDS TXWY A; I SENSED HE WAS GOING TO NOW PUSH US ONTO TXWY A; SO I CALLED HIM; BUT THIS TIME NOTHING GOT HIS ATTN: NOT THE HEADSET; NOR THE GND HORN; NOT EVEN ALL THE LIGHTS ON A B767. IT WAS DAYTIME; BUT THE LNDG LIGHTS ON THE NOSE ARE VERY BRIGHT AND HE WAS EYE LEVEL AND LOOKING RIGHT AT THEM. FINALLY; I GOT A WING WALKER'S ATTN AND HE GOT THE DRIVER TO STOP. IN THE MEANWHILE; I SAW THAT NO ACFT WERE APCHING ON TXWY A; SO I NEVER FELT THE JET WAS IN DANGER AND DID NOT TAKE MORE AGGRESSIVE ACTION THAT MAY HAVE DAMAGED THE NOSE GEAR; TOW BAR; AND VERY IMPORTANTLY; GND PERSONNEL. NATURALLY; GND CTL WAS A LITTLE BUSY AND IT TOOK A MOMENT TO GET A CALL TO THEM. BY NOW WE WERE PULLING BACK INTO THE ALLEYWAY; AND GND CLRED US ONTO TXWY A. THE PUSHBACK THEN PROCEEDED WITHOUT INCIDENT. I DON'T KNOW IF THE TUG DRIVER'S HEADSET WAS FAULTY; BUT MORE BELIEVE HE WAS NOT PROPERLY TRAINED TO KEEP IT SECURELY ON HIS EARS AND TO RESPOND TO VOICE; AND LIGHTS. I DID CALL ACR OPS AND RPT THE BEHAVIOR.