AN ACR DC8 FREIGHTER FLC CLBING TO FL350 HAS AN NMAC WITH A FOREIGN FLAG CARRIER AT FL328 OVER A VOR. THE FOREIGN ACR DID THE EVASIVE ACTION; AS THE RPTR HAD JUST BROKEN OUT OF THE UNDERCAST AND DID NOT SEE THE OTHER ACFT UNTIL IT WAS IN ITS EVASIVE TURN. THE NEXT ARTCC CTL CONFIRMED THAT THEY HAD PASSED THE OTHER ACR'S INFO ON TO SEGU.

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APCHING ESV VOR (ETA XB30); ACFT CLRED TO FL350. OVER ESV VOR OUT OF ALT FL328; SPOTTED ACFT JUST A FEW FT IN FRONT. OTHER ACFT VEERED TO HIS L (WAS IN L TURN). I RPTED THIS TO GUAYAQUIL CTR. THERE WAS NO REPLY; BUT LOTS OF SPANISH SPEAKING EXCITEMENT FROM ACFT TO CTR. FROM BOGOTA ATC I LEARNED IT WAS A FOREIGN FLAG CARRIER AT FL330; ETA ESV XB30 AND GUAYAQUIL CTL WAS INFORMED OF ALT AND ETA ESV. PLEASE NOTE: MY OBSERVATION: FOR THE PAST YR I HAVE VERY FREQUENTLY FLOWN THIS RTE FROM MIA-SPIM-SEQU- SEGU. COM IN AND OUT OF GUAYAQUIL AIRSPACE HAS BEEN MARGINAL. POOR RECEPTION; POOR ENGLISH; MANY CALLS GO UNANSWERED AND WHEN AN ANSWER COMES THROUGH; ALL ACFT RESPOND AT SAME TIME. LONG CONVERSATIONS IN SPANISH EXP: FULL WX RPT FOR SEQU-SEGU-MANTA ARPT (NO ATIS AVAILABLE). TOO LARGE A SECTOR (360 DEG SECTOR) ON FREQ 128.3. INCLUDING ALL TFC IN AND OUT OF SEQU. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR IS A DC8-62F CAPT WHO FLIES TO THIS AREA OF THE WORLD AS A REGULAR PART OF HIS JOB. HE SAID THAT HE UNDERSTANDS THE LANGUAGE IF IT IS SPOKEN SLOWLY AND CLRLY; BUT AFTER THE NMAC THE VARIOUS PARTIES WERE SO UPSET AND SPEAKING SO LOUDLY AND SO QUICKLY THAT HE WAS UNABLE TO DETERMINE WHO WAS SPEAKING AT TIMES. HE DID CONFIRM WITH THE OPPOSITE DIRECTION TFC ITS IDENT AND THAT IT WAS A B757-200 AND THAT NOBODY WAS INJURED. HE SAID THAT HE THEN SWITCHED; ON HIS OWN; TO SKED CTL AND THEY CONFIRMED THE IDENT OF THE OPPOSITE DIRECTION TFC AND THAT THEY HAD PASSED THIS INFO TO SEGU ALONG WITH THE ESV XING ESTIMATE WHICH WAS THE SAME AS THE RPTR'S. THE RPTR ALLEGED THAT THE SKED CTLR REMARKED THAT SEGU DOES THIS ALL OF THE TIME. THE RPTR SAID THAT HE THEN WENT BACK TO SEGU FREQ ON HIS OTHER RADIO AND ATTEMPTED TO SPEAK WITH THE CTLR. THIS TIME HE WAS ABLE TO AGAIN SPEAK BRIEFLY TO THE OTHER CARRIER; BUT ALL OTHER COM WAS CONTINUALLY BLOCKED BY VARIOUS ANGRY EXCHANGES IN SPANISH. HE SAID THAT HE THEN GAVE UP. THE RPTR SAID THAT HE IS ALWAYS CONSCIOUS OF THE CTLR'S AND OTHER CARRIERS' FLC'S SENSITIVITIES TO PERCEIVED CRITICISM IN THIS AREA AS THIS HAS RESULTED IN SOME TROUBLES FOR HIS COMPANY AND ITS FLCS IN THE PAST. THE PRIMARY PROB FOR THIS PARTICULAR CTL SECTOR; THE RPTR SAID; IS THAT IT IS SO LARGE AND IT USES THE SAME FREQ FOR EVERYONE AND ALL OF THE TFC ALONG THE W COAST OF THE CONTINENT PASSES THROUGH IT. THERE IS A CONSTANT PROB WITH TFC CONGESTION AND THE CTLRS SEEM TO BE THE LEAST WELL TRAINED AND EQUIPPED ACCORDING TO THIS CAPT.