Definition of VoIP
What is VoIP?
IP Telephony, also called 'Internet telephony', is the technology that makes it possible to have a voice conversation over the Internet or a dedicated Internet Protocol (IP) network instead of dedicated voice transmission lines.
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VoIP
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Selecting VoIP for Your Enterprise
Discusses the factors involved in selecting VoIP for the enterprise.
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The question of return on investment (ROI) of VoIP
This article will focus on how to create a solution depending on the enterprise's situation, and there are many considerations. Initially the key aspect is to understand how much the customer is planning to change their existing architecture. Will the customer maintain legacy equipment and cabling while adding on a new VoIP service?
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Migrating to VoIP and IP-based Messaging Systems
Some key considerations for carriers preparing to offer existing and new messaging services across traditional wireline, wireless, and the new IP-based networks.
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Enabling VoIP Services with an Effective Operations Management Strategy
Whether evolving an existing circuit-switched network to IP or building a Greenfield, softswitch-driven network Service Providers can offer competitive, secure, reliable, and cost-effective VoIP services.
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Voice Over IP (VoIP) Howto
This document explains about VoIP systems. Recent happenings like Internet diffusion at low cost, new integration of dedicated voice compression processors, have changed common user requirements allowing VoIP standards to diffuse. This howto tries to define some basic lines of VoIP architecture.
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H.323 Mediated Voice over IP:Protocols, Vulnerabilities & Remediation
VoIP protocols can be classified according to their role during message transmission. H.323 and SIP are signaling protocols and thus, they are involved in call setup, teardown, and modification. RTP (real-time transport protocol) and RTCP (real-time transport control protocol) are media transport protocols, and are involved in end-to-end transport of voice and multimedia data. TRIP, SAP, SRP, OSP, et. al. comprise a group of VoIP-related support protocols. Finally, because H.323 mediated VoIP relies upon the underlying transport layer to move data, more traditional protocols that security professionals are familiar with, such as TCP/IP, DNS, DHCP, SNMP, RSVP, and TFTP, may be required.
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Hosted NAT Traversal Unlocks VoIP Service Provider Offerings
The application is usually delivered via a session border controller (SBC) that is deployed in the carrier/service provider network. The goal for service providers and carriers is to be able to seamlessly deliver VoIP services without territorial boundaries or NAT/firewall devices limiting that capability and without changing the IP infrastructure that is typically already in place.
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VoIP Interworking Achieving Transparent Interconnectivity Between H.323 and SIP Networks
While H.323 is the de facto VoIP standard and widely implemented, Session Initiation Protocol (SIP) is quickly gaining in popularity. What carriers need is an approach to interworking that allows them to maximize their investment in legacy H.323 deployments while laying the groundwork for new VoIP services.
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High Availability for Business IP Telephony Assured Voice over IP in Wide Area Networks
New service demands and convergence pressures are forcing a rapid evolution in IP telephony. As IP telephony products and services mature, the pace of integration with new and existing enterprise networks continues to increase. Voice protocols now offer a richer set of features, greater scalability, and more standardization than only a few years ago.
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Delivering Predictable IP Communications Quality of Service for Voice over IP
Converging voice and data services over the same IP-based network and supporting each class of service in a manner consistent with their traditional requires the ability to offer and support differentiated services. Each service type has specific quality of service attributes that must be observed. Voice, in particular, demands low latency, low delay, and low loss if the IP telephony applications are to mimic the traditional offerings from the PSTN.
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