ACR X UNAUTH AIRSPACE ENTRY FAILED TO CONTACT FOREIGN APCH CTL FOR CLRNC THROUGH AREA.

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ACR X ROUTING WAS B55 MCT J36 LATEM A1S TELEM A1ED PRA W40 KKJ G590 BBN ATS GGC A201 LSO A599 POU R473 CH VHHH. BLOCK OUT TIME WAS XX00 GMT WITH THE BLOCK IN AT XY00 GMT. TRAVELING EBOUND ON A201 PRIOR TO PIGAS INTXN; ENRTE CHART ME (H/L) 5 PANEL 5; CALCUTTA CTL TOLD US TO RPT ANSOS INTXN TO CALCUTTA CTL. HOWEVER; PRIOR TO PIGAS INTXN YOU ARE REQUIRED TO CONTACT DHAKA CTL FOR PERMISSION TO TRANSIT THE DHAKA APCH CTL AREA. CALCUTTA CTL DID NOT TELL US TO RPT PIGAS TO DHAKA CTL. I HAD NOTICED THAT ANSOS INTXN IS THE INDIA/MYANAR FIR BUT FAILED TO NOTICE THAT PIGAS INTXN WAS THE INDIA/BANGLADESH FIR. I DO NOT REMEMBER THE RADIO FREQ THAT WE WERE MONITORING; HOWEVER; APCHING AAT VOR DHAKA CTL CALLED US DEMANDING TO KNOW WHEN WE HAD RECEIVED CLRNC THROUGH THE DHAKA APCH CTL AREA. SINCE WE HAD NEVER CALLED DHAKA CTL WE HAD NEVER RECEIVED A TRANSIT CLRNC. THE DHAKA CTLR WAS NOTICEABLY UPSET AND ADVISED US THAT HE WOULD BE FILING A RPT AGAINST US. THERE IS A BOXED NOTE ON PANEL 6 OF THE ENRTE CHART STATING THAT YOU MUST CONTACT DHAKA APCH 'BEFORE ENTERING APCH CTL AREA.' HOWEVER; THERE IS NO BALL FLAG ALONG A201 BTWN GGC VOR AND RAJ VOR TO DRAW YOUR ATTN TO THIS BOXED NOTE. WE WERE ON AN APPROVED FLT PLAN AND HAD BEEN IN CONTACT WITH A CTL FACILITY (CALCUTTA CTL) JUST A FEW MINS PRIOR TO DHAKA CTL CONTACTING US; SO I FEEL THAT WE WERE NOT A HAZARD TO ANY OTHER FLTS IN THE AREA. SINCE DHAKA CTL BELIEVES THAT IT IS EXTREMELY IMPORTANT THAT THEY MAINTAIN POSITIVE CTL OVER ALL ACFT TRANSITING THEIR AIRSPACE THE ENRTE CHART SHOULD REFLECT THIS BY INCLUDING A BALL FLAG ON THE AIRWAY AND ON THE BOXED NOTE DIRECTING THE FLC'S ATTN TO THE NECESSARY RADIO PROCS TO BE FOLLOWED IN TRANSITING THE DHAKA APCH CTL AREA. UPON LNDG IN HONG KING I IMMEDIATELY ADVISED MY CHIEF PLT OF DHAKA CTL'S INTENTIONS.