Telephone switching systems III : section A : numbering and trunking schemes
National Extension College.
Telephone switching systems III : section A : numbering and trunking schemes [Books]. National Extension College. - Cambridge National Extension College 1982
0860825329 0.00
Telephone switching systems, Electronic.
TK/6397 / NUM
Telephone switching systems III : section A : numbering and trunking schemes [Books]. National Extension College. - Cambridge National Extension College 1982
0860825329 0.00
Telephone switching systems, Electronic.
TK/6397 / NUM