ZDC INTRAFAC COORD BREAKDOWN BTWN 2 CTLRS AND INCORRECT INTERIM ALT COMPUTER ASSIGNMENT.

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ACR Y WAS A B727; FLYING THE TERKS 2 STARTING ABOUT 20 MI W OF FAK AT FL210. ACR X WAS A B757 THAT HAD DEPARTED RIC ARPT; DIRECT MOL ENRTE TO SDF. I WAS WORKING ZDC SECTOR 60/52 WHEN ZDC SECTOR 21 CALLED AND REQUESTED TO SEND ACR X DIRECT MOL INSTEAD OF THE YEAST 1 (SID). I SAID APPROVED. THE ZDC 21 CTLR FLASHED THE HDOF ON ACR X WITH AN INTERIM ALT OF FL200. BUT WHAT ZDC 21 HAD DID WAS CLB THE ACFT TO FL230 AND SWITCH THE FREQS TO ZDC SECTOR 60. WHEN ACR X CHKED IN WITH ZDC SECTOR 60; THE RADIO XMIT KEY WAS SWITCHED TO 'ON;' FORCING ACR X'S CALL INTO A SPEAKER. I HEARD THE CALL OF ACR X; BUT NOT THE ALT CLBING TO. I INFORMED ACR X TO EXPECT HIGHER IN ABOUT 6 MINS; DUE TO TFC. I ISSUED TFC TO ACR Y 12 O'CLOCK POS AND 20 MI OPPOSITE DIRECTION; A B757 CLBING TO FL200; AND THEN SWITCHED ACR Y TO FREQ 133.9. I THEN ISSUED TFC TO ACR X; 12 O'CLOCK POS; 20 MI OPPOSITE DIRECTION A B727 DSNDING TO FL210. WHEN THE ACFT WERE 5 MI; I ISSUED TFC TO ACR X AGAIN; 12 O'CLOCK 5 MI; 1000 FT ABOVE. I THEN NOTICED ACR X'S MODE C AT FL203. I QUESTIONED THE ASSIGNED ALT - FL200. THEY STATED THEY WERE ASSIGNED FL230. I NOW NOTICED THEIR MODE C AT FL207 AND ACR X SAID THEY HAD THE TFC IN SIGHT. THE 2 ACFT PASSED WITHOUT FURTHER INCIDENT. THE RADIO CTL SWITCH ON THE VOICE SWITCHING COMMAND SYS IS TURNED ON WHEN YOU GET A LANDLINE CALL OR OVER RADIO CALL. THIS IS SO IF AN ACFT IS SAYING SOMETHING ON YOUR FREQ - IT DOESN'T STEP OR BLOCK OUT THE CTLR. THE CALL IS RERTED TO AN OVERHEAD SPEAKER.