Narrative:

En route to sjc from las at ZOA said for air carrier abbx to descend to FL270. I read back clearance and the captain started down. We were then told to contact joshua approach. I read back the frequency and changed over. On joshua frequency, they told us to go back to ZOA. Upon checking in I reported descending to FL270, and center said negative, remain at FL310 and turn 30 degrees right. The captain leveled off immediately and began the turn and climbing back to FL310. Center asked us to turn further right when I reported level at FL310 and he cleared us back direct hyp. He then issued a frequency change to air carrier baay who was at FL270. We saw traffic on TCASII at about 8 mi and 2600 ft below us, was about the closest we got, no RA. We asked the controller if there was a problem and he said it was ok and handed us off.

Related reports:

Google
 

Original NASA ASRS Text

Title: A319 WITH ZOA AT FL310 ACCEPTS DSCNT CLRNC AND FREQ CHANGE FOR SIMILAR CALL SIGN ACFT.

Narrative: ENRTE TO SJC FROM LAS AT ZOA SAID FOR ACR ABBX TO DSND TO FL270. I READ BACK CLRNC AND THE CAPT STARTED DOWN. WE WERE THEN TOLD TO CONTACT JOSHUA APCH. I READ BACK THE FREQ AND CHANGED OVER. ON JOSHUA FREQ, THEY TOLD US TO GO BACK TO ZOA. UPON CHKING IN I RPTED DSNDING TO FL270, AND CTR SAID NEGATIVE, REMAIN AT FL310 AND TURN 30 DEGS R. THE CAPT LEVELED OFF IMMEDIATELY AND BEGAN THE TURN AND CLBING BACK TO FL310. CTR ASKED US TO TURN FURTHER R WHEN I RPTED LEVEL AT FL310 AND HE CLRED US BACK DIRECT HYP. HE THEN ISSUED A FREQ CHANGE TO ACR BAAY WHO WAS AT FL270. WE SAW TFC ON TCASII AT ABOUT 8 MI AND 2600 FT BELOW US, WAS ABOUT THE CLOSEST WE GOT, NO RA. WE ASKED THE CTLR IF THERE WAS A PROB AND HE SAID IT WAS OK AND HANDED US OFF.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.