By Samrat Ganguly
ISBN-10: 0470319569
ISBN-13: 9780470319567
ISBN-10: 0470997923
ISBN-13: 9780470997925
Understand how new community applied sciences influence VoIP!
Voice over web Protocol (VoIP) is revolutionizing the best way humans converse – either within the company global and in own lifestyles. the large good fortune of VoIP has ended in its adoption in quite a lot of networking applied sciences. each one community expertise has its particular beneficial properties and poses special demanding situations for the functionality of VoIP.
VoIP: instant, P2P and New firm Voice over IPdescribes the problems coming up within the deployment of VoIP in an rising heterogeneous community surroundings. in addition to a short review of the strategies, protocols, algorithms, and kit inquisitive about understanding VoIP, this ebook specializes in components: caliber and function matters in deploying VoIP over a number of community settings, and the hot mechanisms and protocols in those rising networks to aid the deployment of VoIP.
VoIP: instant, P2P and New firm Voice over IP:
- Discusses the fundamentals of VoIP, VoIP formats and VoIP Protocols together with SIP and H.323.
- Details new applied sciences reminiscent of P2P know-how, VoWiFi, WiMax, and 3G Networks.
- Explains the QoS matters coming up from deploying VoIP utilizing the hot technologies.
- Solves the functionality concerns that come up while VoIP is deployed over varied community technologies.
This e-book is a useful source for pro community engineers, designers, managers, researchers, selection makers and undertaking managers overseeing VoIP implementations. marketplace analysts, specialists, and people learning complicated undergraduate and graduate classes on facts, voice and multimedia communications also will locate this e-book insightful.
Read Online or Download VoIP: Wireless, P2P and New Enterprise Voice over IP PDF
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Additional resources for VoIP: Wireless, P2P and New Enterprise Voice over IP
Sample text
We elaborate their impact on VoIP here. 2 Delay Delay is the time taken by a packet to travel from one point to another (one-way) in a network. It is easy to measure the round-trip delay of the Internet. The performance of codecs differs due to their ability to tolerate delay, but a good rule of thumb is to limit the one-way delay to about 150 ms. VoIP packet delay is comprised of the following components: • Propagation Delay: This delay is proportional to the speed of light and depends on the physical distance between the two communicators.
Therefore, there are no end-to-end QoS guarantees provided to date. However, the current situation is slowly improving. Next generation wireless access networks such as WiMAX are providing QoS control mechanisms to support VoIP. Architectures such as IP Multimedia Subsystem 26 BASICS OF VoIP (IMS) are being proposed to support QoS. Even wireline access networks are also being geared towards providing some level of QoS to the end-user. At the same time, there are various higher layer transport mechanisms being proposed to circumvent the lack of QoS in the Internet.
The lower mode values (0, 1, 2) are meant for operation in the CDMA2000 network supporting narrowband speech coding. In mode 3, the VMR-WB operates as AMD-WB. 2 Speex Speex codec was designed specifically for VoIP over broadband connections. The design goals have been to make a codec that would allow both very good-quality speech and support multiple bit rates. Furthermore, Speex was designed to be robust to packet loss. Speex is based on CELP and supports ultrawideband (32 kHz), wideband (16 kHz sampling rate) in addition to narrowband (8 kHz sampling rate).