Information technology. Telecommunications and information exchange between systems. Private integrated services network. Specification, functional model and information flows. Advice of charge supplementary services
Keyword(s):
2015 ◽
2015 ◽
2015 ◽
Keyword(s):
1997 ◽
2015 ◽
1999 ◽
1999 ◽
Keyword(s):
1999 ◽
1996 ◽
2015 ◽