1[1]ITU - T Recommendation H.320,Narrow - band ISDN visual telephone systems and terminal equipment,Geneva,1993.
2[2]ITU -T Recommendation H.324,Terminal for low bit rate multimedia communication,Geneva,1996.
3[3]ITU-T Recommendation H.323,Visual telephone systems and terminal equipment for local area networks which provide a non- guaranteed quality of service,Geneva,1996.
4[4]ITU - T Recommendation H.310,Broadband audiovisual communication systems and terminals,Geneva,1996.
5[5]ITU-T Recommendation H.323v2 Packed based multimedia communications systems,Geneva,1998.
