Mr. Pejman,
u might have heard bout the round trip delay for the satellite link…its 520ms + the internal system delay for GSM calculates up to 180ms giving a total delay =700ms…this is huge enough to setup and maintain a call on satellite abis..which leads to abnormal behaviours of the systems…Bieng very costly too..thats y this has been not considered as a regular setups..
regards
Neeraj