Tài liệu Thực hiện tiếng nói qua IP (P7) ppt
Tài liệu Thực hiện tiếng nói qua IP (P7) ppt
... di¤erent sets of IP
addresses to guarantee the required quality of service; and
d. Deployment of IP version 6 (IPv6, IETF’s RFC 2460/1883) or IP version
4 (IPv4, IETF’s RFC 791) with IPSec infrastructure ... incorporate IP telephony in a traditional PBX, either a VoIP line card or
IP- BASED CENTREX AND PBX SERVICES
111
an adjacent IP telephony GW, along with a VoIP call controller,...
Tài liệu Thực hiện tiếng nói qua IP (P4) pptx
... EVALUATING VoIP SERVICE
4
CRITERIA FOR EVALUATING VoIP
SERVICE1
In this chapter, I describe a set of important criteria that can be used to per-
form qualitative and quantitative measurements of IP phone ... voice packets; (c) use multiple moderate-
speed WAN IP links for VoIP applications, and periodically monitor the utili-
zation of these links in order to route the VoIP calls and tra‰...
Tài liệu Thực hiện tiếng nói qua IP (P6) ppt
... IP phones to high-end residential and enterprise markets.
IP- PBX, IP CENTREX, AND IP- BASED PBX TIE LINES
IP- PBXs are PBX devices that support the following:
a. Various IP telephony and/or VoIP ... VoIP and Related Features and Functionalities Expected from
IP- PBX and IP- Centrex
Simultaneous support
of IP and POTS
(analog, digital,
ISDN-BRI) phones
Support of VoIP for both ac...
Tài liệu Thực hiện tiếng nói qua IP (P1) doc
... international o‰ces, VoIP implementation may be
preferable because such corporations may already have a large operational IP
or overlay -IP network in place. The addition of VoIP service in such networks
may ... o¤ered over an IP network. The resulting architecture demands
VoIP GWs to convert the TDM-formatted voice signal into IP packets at
the ingress and vice versa at the egress. Th...
Tài liệu Thực hiện tiếng nói qua IP (P2) pdf
... congestion in the network.
Even though IPv4 is the most widely used version of IP in the world, the
IETF is already developing the next generation of IP (IPv6, RFC 1883; the
header format is shown ... legacy VoIP protocol. Figure 2-7 shows the protocol layers for real-time
services like VoIP using the H.323 protocol.
Other emerging VoIP protocols are IETF’s session initiation protocol (SI...
Tài liệu Thực hiện tiếng nói qua IP (P3) docx
... as well.
The following variants of SIP have emerged during the past few years: SIP-,
SIP best common practice (SIP-BCP), SIPþ/SIP-T, and so on. However,
SIPþ/SIP-T appears to be the most useful ... and hardware-based SIP and IP phones were available.
For call routing over a large IP network, SIP may use the TRIP (telephony
routing over IP, a work-in-progress in IETF’s IPTel WG, RFC 2871)...
Tài liệu Thực hiện tiếng nói qua IP (P5) pdf
... Without
proper synchronization of the asynchronously operating IP- PSTN GWs and
other IP domain network elements like routers and SIP or IP phones, voice
quality and service reliability cannot be assured.
The ... the critical IP domain network elements (such as IP-
PSTN GWs, CC, and softswitch) and applications clients (such as IP phones)
to synchronize precisely with the NTS over...
Tài liệu Thực hiện tiếng nói qua IP (P8) docx
... CALLS
123
the VoIP or IP- telephony service within a corporation are IP- PSTN MGWs or
VoIP GWs, VoIP call servers or call managers, IP phones, an uninterrupted
power supply (UPS), and Ethernet and IP switches ... using IP- based network. The IP- PSTN MGWs of Figure 3-8
are now replaced by the IP- PBXs. The VoIP GW and CC (Fig. 8-2) control the
resources in the VoIP line cards of the...
Tài liệu Thực hiện tiếng nói qua IP (P9) pdf
... CHALLENGES
SIP-based VoIP service can be introduced in any operational IP network of
an enterprise by deploying the SIP server-based VoIP call controller (CC), call
manager, or call server. The SIP server ... of plug-and-talk-based IP phones. These phones can support
VoIP service over IP- based networks equipped with a call controller (CC) and
MGW. As discussed in Chapter 6, IP phones...
Tài liệu Thực hiện clean boot trong Windows XP pptx
... đó là Restart để khởi động lại máy.
Sau khi Windows khởi động lại, xác định xem liệu các dấu hiệu cũ có còn xuất hiện
không.
Chú ý: Xem xét lại cẩn thận trên tab General xem các hộp kiểm bạn ... Error Reporting) và xoá vĩnh viễn tất cả các điểm phục hồi cho
tiện ích System Restore. Đừng thực hiện điều này nếu bạn muốn giữ lạ
i các điểm phục
hồi System Restore hoặc nếu bạn phải dù...
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