H
H.223
379–80
H.225
145
H.261
117
H.323
145
hackers, future prospects
451
handover procedures, SRVCC
431–47
headers, SIP headers
18–19
,
63–80
,
95–104
,
148–57
,
162–83
,
193–4
,
196–7
,
203–9
,
215–22
,
234
,
242–9
,
252–69
,
272–85
,
481
,
483–7
header parameter
163
helpdesks
310–11
high layer compatibility
369
History-Info SIP header
389
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