國際海(hai)(hai)事衛星電(dian)(dian)話(hua)(International Maritime Satellite Telephone Service)是(shi)指通(tong)過國際海(hai)(hai)事衛星接通(tong)的船與(yu)(yu)岸(an)、船與(yu)(yu)船之間(jian)(jian)的電(dian)(dian)話(hua)業務。海(hai)(hai)事衛星電(dian)(dian)話(hua)用(yong)于船舶(bo)與(yu)(yu)船舶(bo)之間(jian)(jian)、船舶(bo)與(yu)(yu)陸地之間(jian)(jian)的通(tong)信，可進行通(tong)話(hua)、數(shu)據傳輸和傳真(zhen)。

? ? 海(hai)事(shi)衛星(xing)(xing)通信(xin)系統(tong)主要由同步通信(xin)衛星(xing)(xing)、移動終端、海(hai)岸地球站(zhan)以及(ji)協調控制站(zhan)等構(gou)成。海(hai)事(shi)衛星(xing)(xing)電話(hua)除了傳統(tong)的電話(hua)功能外，還可以進行傳真、電子郵(you)件以及(ji)數(shu)據傳輸、船隊管理(li)、船隊安全網和緊(jin)急狀態(tai)示(shi)位標。?

? ? 海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)組織原是(shi)一(yi)個提(ti)供(gong)全球范(fan)圍衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)移(yi)動(dong)通信的(de)政府間合作機構，即國際(ji)移(yi)動(dong)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)組織，國內習(xi)慣簡稱為海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)。海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)電話(hua)的(de)業(ye)務種類(lei)有遇險電話(hua)、叫號電話(hua)和(he)(he)叫人電話(hua)。我國各地(di)均開放海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)電話(hua)業(ye)務。海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)電話(hua)通過(guo)國際(ji)公用電話(hua)網和(he)(he)海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)網連(lian)通實(shi)現。海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)網路由海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)、海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)地(di)球站、船站以及終端設備組成。海(hai)(hai)事(shi)(shi)(shi)衛(wei)(wei)(wei)(wei)(wei)星(xing)(xing)(xing)(xing)(xing)覆(fu)蓋太平洋、印度洋、大西(xi)洋東區和(he)(he)西(xi)區。?

? ? 每個(ge)洋(yang)區(qu)有一個(ge)由3位數字(zi)組成的編碼(ma)：太平(ping)洋(yang)地區(qu)為“872”，印度洋(yang)地區(qu)為“873”，大西(xi)洋(yang)東區(qu)為“871”，西(xi)區(qu)為“874”。 ?

? ? 船只(zhi)的電(dian)話號碼一(yi)般(ban)按編號辦法(fa)規定由7位數(shu)字組成。?

? ? 海事衛星(xing)電話可由用戶自(zi)己直撥或通過話務員接續(xu)。?

? ? 陸地(di)用(yong)戶直(zhi)撥國際(ji)海(hai)事(shi)衛星電(dian)話(hua)的(de)撥叫格式為： 國際(ji)冠字 洋區編碼(ma)(ma) 船只電(dian)話(hua)號碼(ma)(ma) 國際(ji)海(hai)事(shi)衛星電(dian)話(hua)業務(wu)的(de)資(zi)費(fei)由(you)公用(yong)電(dian)話(hua)網和海(hai)事(shi)衛星網兩部分(fen)費(fei)用(yong)組(zu)成。