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file icon Why more bandwidth can be a really BAD thinghot!
04.12.2006
Opinion piece on why ADSLs/+ is not a service naturally compatible with VoIP.
Homepage: http://www.vcomm.co.uk
Hits: 8334
file icon White Paper on SIP Servers (RADVISION)hot!
05.04.2004
SIP Servers are essential network elements that enable SIP endpoints to exchange messages, register user location, and seamlessly move between networks. SIP Servers enable network operators to install routing and security policies, authenticate users and manage user locations.
Hits: 19233
file icon Understanding SIP (Ubiquity)hot!
22.07.2004
This paper provides a high-level overview of what SIP is and does. It charts SIP's migration from the laboratory to the marketplace. It describes the services SIP provides and the initiatives underway that will spur its growth. It also details the key features that distinguish SIP among protocols and diagrams how a SIP session takes place.
Hits: 26044
file icon Testing SIP to Saturation (UNH-IOL)hot!
07.09.2006
The SIP (session initiation protocol) signaling protocol is emerging as the industry’s preferred Voice over IP (VoIP) technology. As such, SIP’s scalability is key to VoIP technology’s continued adoption, and the need to test SIP user agents and servers under heavily saturated scenarios is becoming more acute. SIP servers must be able to bear heavy traffic loads for user registration and call setup functions that require reading from and writing to one or more large dynamic database(s). The corresponding test tools, call generators, terminators and analyzers must all be capable of processing the same significant loads. The University of New Hampshire InterOperability Laboratory (UNH-IOL) can test a large variety of VoIP and traditional telephony systems; however the focus of this paper is not to demonstrate the comparative performance of individual SIP servers, but rather to delineate issues involved in testing SIP servers under heavy call saturation.
Homepage: http://www.iol.unh.edu/
Hits: 14677
file icon Summary Test Report: Acme Packet Net-Net PAC (CT Labs)hot!
14.03.2006

CT Labs was contracted by Acme PacketTM to verify the performance of the Acme Packet Net-Net PACTM session border controller and to produce a report summarizing the results. To facilitate this Empirix provided testing products, script engineering, and lab facilities to support this high call volume test. During the test, quality assurance engineers from Acme Packet were available to help configure and support their product.

Hits: 16122
file icon Solving the Firewall/NAT Traversal Issue of SIP: Who Should Control Your Security Infrastructure?hot!
17.05.2007
Solving the Firewall/NAT Traversal Issue of SIP: Who Should Control Your Security Infrastructure? Session Initiation Protocol (SIP) has become the signaling protocol of choice for realtime communications, including Voice over IP (VoIP){mosimage}. However, SIP communication does not reach users on the local area network (LAN) behind firewalls and Network Address Translation (NAT) routers automatically. This issue of SIP traffic not traversing the enterprise firewall or NAT is critical to any SIP implementation, including VoIP. Until all firewalls are SIP capable in order to support the wide-scale deployment of realtime enterprise communications, several solutions have been proposed to work around the firewall/NAT traversal problem. Many of these solutions have serious security implications; there are also solutions that allow you to remain in control. The choice of method for traversing firewalls/NATs is, to a large extent, dependent on the answer to the questions: “Who should be in control of your security infrastructure: the firewall administrator, the user or a service provider?” and, “Do we want a solution that is predictable and functions reliably with SIP standard compliant equipment or is it sufficient with a best effort solution that works in certain scenarios and, perhaps, only with a specific operator?” This white paper outlines the pros and cons of each solution, so you can make the best decision for your network.
Homepage: http://www.ingate.com
Hits: 11418
file icon SIP_Security_white_paper_Ahot!
13.01.2006

Person-to-person realtime IP communications, like presence, VoIP and video applications, offer clear benefits for the enterprise as time- and money-savers. Unified functionality is now available, where all of the above are integrated into one streamlined application and interconnect with other networks. This creates a very important business tool and usage is increasing.

Session Initiation Protocol (SIP) has emerged as the protocol that will fuel this development. Its simplicity and the fact that it is based on Internet standards give SIP clear advantages over older protocols. Analysts predict that SIP will dominate and the evidence given by actual deployments among service providers and equipment vendors further support that prediction.

This white paper describes the security issues associated with SIP, and how to address them within enterprise domains.

Hits: 30446
file icon SIPconnect_Whitepaperhot!
12.09.2006
This White Paper describes the market view of the SIPconnect Recommendation created by the IP PBX to Service Provider connectivity task group within the SIP Forum Technical Working Group.
Homepage: http://www.sipforum.org/content/view/273/227/
Hits: 37138
file icon SIParator_Whitepaper_Ahot!
13.01.2006

Support for Session Initiation Protocol, or SIP, is essential in today_Ts enterprise communications environment. With the standardization of SIP as the Internet protocol for applications such as VoIP, instant messaging and IP telephony, businesses are eager to adapt their existing hardware to accept SIP. However, far too many companies have made substantial investments into legacy firewall technologies that are not capable of supporting this type of communication. In addition, enterprises are reluctant to touch existing security infrastructure for fear of creating security breaches.

The award-winning Ingate SIParator® addresses these issues by offering the introduction of a SIP-capable communications infrastructure while preserving the investment made in legacy firewalls.

Hits: 15501
file icon SIP: The Next Step In Converged IP Communications (Cisco)hot!
30.06.2004
Session Initiation Protocol (SIP) builds on the IP communications foundation by providing a standards-based approach to enabling IP communications with numerous devices and applications. This paper describes the benefits of SIP to enterprise customers and explains the comprehensive CiscoR roadmap for delivering SIP-based solutions_"an evolving strategy that helps deliver stronger IP communications benefits to enterprise customers today and in the future. Organizations that adopt Cisco solutions can reap the benefits of IP communications and establish a solid foundation to support new and emerging SIP networking technologies.
Hits: 16698
file icon SIP: Protocol Overview (Radvision)hot!
20.02.2004
The Session Initiation Protocol (SIP) is a signaling protocol for initiating, managing and terminating voice and video sessions across packet networks. SIP sessions involve one or more participants and can use unicast or multicast communication. Borrowing from ubiquitous Internet protocols, such as HTTP and SMTP, SIP is text-encoded and highly extensible. SIP may be extended to accommodate features and services such as call control services, mobility, interoperability with existing telephony systems, and more.

SIP is being developed by the SIP Working Group, within the Internet Engineering Task Force (IETF). The protocol is published as IETF RFC 2543 and currently has the status of a proposed standard.

This White Paper describes the key constituents of SIP.

Hits: 21361
file icon SIP-related White Paper (Alcatel)hot!
01.01.2003
Present enterprise communications systems and applications provide integration of voice and data services. Still, proprietary technology and architecture discrepancies make it difficult to implement and deploy new converged communications services. The Session Initiation Protocol (SIP) brings user centric Internet Telephony. This model provides new converged communications services based on presence, mobility and user preferences. SIP technology promotes distributed architecture models, and seamless integration with IP technology. SIP is an open extensible Voice over IP (VoIP) protocol and is a framework for building voice and data communication applications. This article presents what SIP brings to enterprise communication applications and how customers can manage a smooth transition to SIP based services with the example of the OmniPCXIP communication server.

Hits: 15185
file icon SIP White Paper (Nortel Networks)hot!
01.02.2003
Services that consumers and enterprises are willing to pay for !
Hits: 15687
file icon SIP Specifications and the Java™ Platformshot!
01.09.2003
The goal of this whitepaper is to identify the specifications to the Session Initiation Protocol (SIP)[1] defined through the Java Community ProcessSM (JCPSM) [2]. This document inspects each Java SIP specification describing the functionality, architecture, platform supported and how each interface relates to the other Java interfaces to SIP. This is not a tutorial on SIP or the Java language [3] and it is assumed that the reader has a reasonable understanding of both the Java language and the SIP protocol and their potential functions within an IP Communications network.
Hits: 12013
file icon SIP Server Technical Overview (Radvision)hot!
21.07.2004
With the advance of SIP, server logic has become increasingly complex. SIP Servers need to deal with varying network topologies (such as public Internet networks, cellular networks, broadband residential networks), complex routing policies, security and SIP extensions. SIP Servers often need to handle high message/transaction rates and yield real-time performance and scalability, high throughput, and low delay. This chapter discusses the protocol aspects of SIP Server behavior and the usage of the RADVISION SIP Server Platform to address the challenges of effective SIP Server development
Hits: 20231
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