000 00282nam a22001217a 4500
020 _a9788173665318
082 _a621.38
_bWAL/SWI
100 _aWallingford,Ted.,
_97410
245 _aSwitching to VOIP
260 _aNew Delhi
_bO'reilly
_c2015
300 _a477p.
_b[D2][D3]
942 _cBK
999 _c6526
_d6526