國際海(hai)事衛(wei)星電(dian)話(hua)(International Maritime Satellite Telephone Service)是(shi)指通過國際海(hai)事衛(wei)星接通的船與(yu)岸、船與(yu)船之(zhi)間的電(dian)話(hua)業務(wu)。海(hai)事衛(wei)星電(dian)話(hua)用于(yu)船舶(bo)與(yu)船舶(bo)之(zhi)間、船舶(bo)與(yu)陸地之(zhi)間的通信，可(ke)進(jin)行通話(hua)、數據(ju)傳(chuan)輸和傳(chuan)真。

? ? 海事衛星(xing)通(tong)信系統主要由同(tong)步通(tong)信衛星(xing)、移動終端(duan)、海岸地球站(zhan)以(yi)(yi)及協調控制站(zhan)等構成。海事衛星(xing)電(dian)話(hua)除了傳統的電(dian)話(hua)功能(neng)外，還可以(yi)(yi)進(jin)行傳真、電(dian)子(zi)郵件以(yi)(yi)及數據傳輸(shu)、船隊(dui)(dui)管理、船隊(dui)(dui)安全網和緊急狀(zhuang)態示位標。?

? ? 海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)星(xing)(xing)組(zu)織原是一個(ge)提供全(quan)球(qiu)范圍衛(wei)(wei)(wei)星(xing)(xing)移(yi)動(dong)通信的政府間合作機構，即國際(ji)移(yi)動(dong)衛(wei)(wei)(wei)星(xing)(xing)組(zu)織，國內習慣(guan)簡稱為海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)星(xing)(xing)。海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)星(xing)(xing)電(dian)(dian)話(hua)的業務種(zhong)類有(you)遇險電(dian)(dian)話(hua)、叫號電(dian)(dian)話(hua)和(he)叫人(ren)電(dian)(dian)話(hua)。我(wo)國各地均開放(fang)海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)星(xing)(xing)電(dian)(dian)話(hua)業務。海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)星(xing)(xing)電(dian)(dian)話(hua)通過國際(ji)公用電(dian)(dian)話(hua)網和(he)海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)星(xing)(xing)網連(lian)通實現。海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)星(xing)(xing)網路由海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)星(xing)(xing)、海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)星(xing)(xing)地球(qiu)站、船站以及(ji)終端設備(bei)組(zu)成。海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)星(xing)(xing)覆(fu)蓋(gai)太(tai)平洋、印度洋、大西洋東區(qu)和(he)西區(qu)。?

? ? 每(mei)個洋(yang)(yang)區(qu)(qu)(qu)有一個由3位(wei)數字組成的編碼：太(tai)平洋(yang)(yang)地(di)(di)區(qu)(qu)(qu)為“872”，印度(du)洋(yang)(yang)地(di)(di)區(qu)(qu)(qu)為“873”，大西洋(yang)(yang)東區(qu)(qu)(qu)為“871”，西區(qu)(qu)(qu)為“874”。 ?

? ? 船只(zhi)的電(dian)話(hua)號(hao)(hao)碼一(yi)般按編(bian)號(hao)(hao)辦法規定由7位數字(zi)組成(cheng)。?

? ? 海事衛星電話(hua)可由用戶自(zi)己直(zhi)撥或通過話(hua)務員接續。?

? ? 陸地(di)用戶直撥國際(ji)(ji)海事衛(wei)星電話的(de)撥叫格式為： 國際(ji)(ji)冠字(zi) 洋區(qu)編(bian)碼 船(chuan)只(zhi)電話號碼 國際(ji)(ji)海事衛(wei)星電話業務的(de)資費(fei)由公(gong)用電話網和(he)海事衛(wei)星網兩部分費(fei)用組成(cheng)。