Information technology. Telecommunications and information exchange between systems. Private Integrated Services Network. Specification, functional model and information flows. Call transfer supplementary service
2015 ◽
1997 ◽
2015 ◽
2015 ◽
2015 ◽
Keyword(s):
2015 ◽
Keyword(s):
1997 ◽
1998 ◽
Keyword(s):
2015 ◽
Keyword(s):
2015 ◽