000
00282nam a22001217a 4500
020
_a
9788173665318
082
_a
621.38
_b
WAL/SWI
100
_a
Wallingford,Ted.,
_9
7410
245
_a
Switching to VOIP
260
_a
New Delhi
_b
O'reilly
_c
2015
300
_a
477p.
_b
[D2][D3]
942
_c
BK
999
_c
6526
_d
6526