AN ACR MD80 CREW OF ACR X RPTS THAT A B737 OF ACR Y WAS NOT COMMUNICATING ON THE RAMP CTL FREQ. THE RPTING ACFT HAD TO STOP VERY SHORT TO AVOID HITTING ACR Y. 2 CABIN ATTENDANTS WERE KNOCKED TO THE AISLE IN THE INCIDENT; WITHOUT INJURY.

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PWRBACK FROM GATE X COMPLETED AT PIT AND CLRNC RECEIVED FROM RAMP TO TAXI L AROUND THE TERMINAL AND SBOUND TO TXWY D3. ACFT WAS FACING W AND TAXI BEGAN. ABEAM GATE Y; AN ACR Y B737 SUDDENLY APPEARED AT A 90 DEG ANGLE TO US ON THE R HDG S; PROBABLY AT TXWY C4. IT DID NOT APPEAR THAT HE WAS GOING TO STOP; THEREFORE THE CAPT TOOK ACTION TO AVOID A COLLISION BY ABRUPTLY STOPPING OUR ACFT. SUBSEQUENTLY; ACR Y SLOWED DOWN; BUT CONTINUED TO TAXI. DUE TO OUR RAPID STOP; THEY WERE ABLE TO TAXI IN FRONT OF US WITH ADEQUATE CLRNC. THIS IS A CTLED RAMP. RAMP CTL SAID THAT ACR Y HAD NOT CONTACTED THEM AS THEY SHOULD HAVE UPON ENTERING THE RAMP. 2 OF OUR FLT ATTENDANTS WERE KNOCKED AROUND BY THE ABRUPT STOP WE HAD TO MAKE. THIS INCIDENT HIGHLIGHTS THE NEED TO KEEP HEADS OUT OF THE COCKPIT AND CLRING IN AREAS OTHER THAN WHERE TOLD TO EXPECT TFC. ALSO ANOTHER GOOD LESSON ON WHY PAX NEED TO BE SEATED DURING TAXI OPS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR WAS THE FO ON THIS INCIDENT. 2 OF THE 4 CABIN ATTENDANTS WENT DOWN WITH NO RPTED INJURIES. THERE IS A SIGN TELLING ALL ACFT TO BE ON RAMP CTL FREQ. THE RPTR BELIEVES THAT THIS WOULD NOT HAVE HAPPENED IF ACR Y HAD FOLLOWED THE RULES.