00330nam a2200145Ia 4500008004100000020001800041041000800059082001700067100001700084245002200101250001200123260001600135365001600151700001700167230714s9999    xx            000 0 und d  a9790000000000  aeng  a621.385bBEL  aBellamy J.C.  aDigital Telephony  a3rd ed.  bWiley India  cRs.b549.00  aBellamy J.C.