Tips
Tips
-
An introduction to SIP verbs: Register, subscribe, invite
Part 2 of a three part series on the Session Initiation Protocol, this article discusses commonly used SIP codes and response verbs, and explains basic SIP operation. Continue Reading
-
An introduction to SIP and SIP functions
The Session Initiation Protocol (SIP) is the primary protocol that's used by most VoIP and unified communications (UC) products. This is part 1 of a three-part series that will explain how SIP works. Continue Reading
-
Understanding presence technology
Presence technology is an integral part of unified communications, making it possible to locate and identify a device or user wherever it might be. Learn why presence is important. Continue Reading
-
Open source PBX: Risk or value?
Open source IP PBX systems like Asterisk have benefits and risks. Learn what they are and assess your readiness for the IP PBX implementation in this tip from Gary Audin. Continue Reading
-
VoIP security -- Free IP telephony fuzzing tools
Protect your organization's VoIP security with free VoIP security tools designed to test IP telephony vulnerability. Continue Reading
-
Routing basics -- What VoIP managers need to know
Voice over IP (VoIP) requires that an organization's voice staff understand many of the fundamentals of data networking. Routing is an essential data networking function that also applies to VoIP. In this tip, learn more about the routers and ... Continue Reading
-
VoIP traffic: Five steps to prepare your network
VoIP traffic is much more sensitive to latency, jitter and packet loss than most network applications. It is crucial that you ensure that your network is ready to handle this new demand. Continue Reading
-
How silence suppression saves WAN bandwidth
Silence suppression, or voice activation detection (VAD), technology is used to save WAN bandwidth used by VoIP traffic, while comfort noise generation (CNG) counteracts negative affects on VoIP speech quality. Continue Reading
-
IP PBX: Ten reasons to switch
Should you throw out the old PBX and replace it with a new IP PBX? This tip from WindowsNetworking.com provides ten compelling reasons to do so, along with a brief explanation of what an IP PBX is, how it works in a computer network and how it ... Continue Reading
-
VoIP bandwidth: Calculate consumption
The bandwidth needed for VoIP transmission depends on compression technology, packet overhead and the network protocol used. In this tip, learn how to calculate how much bandwidth your VoIP implementation will need. Continue Reading
-
VoIP bandwidth -- Rightsize your WAN for voice traffic
Up-front rightsizing and WAN bandwidth capacity planning are critical aspects of VoIP, and should be done prior to deploying an MPLS network or implementing VoIP. Continue Reading
-
How voice compression saves bandwidth
Compression of voice traffic can save bandwidth on your IP network, but can cost quality or cause delays. Learn more about the CODECs or standards for voice compression -- and their effect on call quality -- in this tip. Continue Reading
-
What's in a VoIP packet -- An introduction to bandwidth for VoIP
Learn what makes up a VoIP packet, how headers work, what protocols transport voice traffic over the Internet and how this traffic uses network bandwidth. Continue Reading
-
VoIP management tools: Calculating ROI
Before purchasing management tools for VoIP, you may need to calculate the return on investment (ROI) to justify the cost of those tools. In this tip, Gary Audin explains how to calculate ROI and provides specific checklists for calculating the ROI ... Continue Reading
-
VoIP maintenance: Creating a schedule for patches and upgrades
VoIP systems fall under the same type of maintenance guidelines as other networking equipment. In this tip, learn guidelines and best practices for scheduling your VoIP systems maintenance. Continue Reading
-
Why you need to learn VoIP for your Cisco certification
Because of the increasing importance of VoIP and Cisco's growing emphasis on it, the networking giant has increased the significance of VoIP in its certification exams. In this tip, David Davis looks at the VoIP focus in popular Cisco certifications... Continue Reading
-
VoIP traffic encryption tools
Securing VoIP traffic remains one of the biggest obstacles to its mainstream enterprise use. VoIP traffic tends to be unencrypted, but that doesn't mean that it has to be. In this tip, Brien Posey explores various options for VoIP encryption, ... Continue Reading
-
VoIP services overview: Defining VoIP terms
The vast majority of conversations about the convergence of voice and data could benefit greatly from a generally accepted vocabulary. The primary culprits in this smorgasbord of confusion are the terms "VoIP" and "IP telephony," which are used ... Continue Reading
-
TFTP servers for testing IP phones
Testing a software upgrade on a single IP phone can present a challenge. In this tip, learn how to implement your own TFTP server for testing your phones' configuration information. Continue Reading
-
Five VoIP security recommendations
Before beginning a successful VoIP rollout across your organization, there are several things you should consider. Continue Reading
-
SIP interoperability and testing
Session Initiation Protocol (SIP) is a signaling protocol typically used for telephony, instant messaging and Internet conferencing. This article discusses the interoperability and testing being done to support this protocol. Continue Reading
-
CDP and multi-vendor networks don't mix
Cisco switches and CDP go hand-in-hand, but when non-Cisco switches and CDP meet, interesting things happen. Continue Reading
-
Defining traffic telecommunications style
There are three types of traffic: voice, data and image -- each with its own set of requirements for transmission. Find out here how these different types of traffic are quantified. Continue Reading
-
Turning analog phones into VoIP phones
How an ATA or broadband phone works and what kind of features and performance you can expect from them. Continue Reading
-
IP telephony implementation planning
Expert advice breaks down a successful IP telephony implementation into two distinct and easy to understand steps. Continue Reading
-
Working with the Layer 2 data link layer in an IP telephony deployment
This IP telephony deployment article provides solutions to performance issues in Layer 2, the data link layer. Continue Reading
-
Learn IT in 10 easy steps: VoIP
This handy guide to VoIP provides you with an overview of the technology, including key terms, trends, challenges and more. Continue Reading
-
System components of VoIP
This is the second tip in a series excerpted from a report by Ohio State University. The report analyzes issues and challenges in the evolving VoIP technology. Continue Reading
-
Policing and shaping within QoS
Learn about the policing and shaping methods within QoS that allow IT professionals to smooth traffic flows for VoIP transmission. Continue Reading
-
DHCP for VoIP
Learn how to set up DHCP for Voice over IP (VoIP) in this article. Continue Reading
-
Don't forget to use multicast
The benefits of using multicast. Continue Reading
-
Survivable remote site telephony
Fault-tolerant telephony solution for smaller remote sites. Continue Reading
-
A case of the jitters
Testing for specific problems affecting VoIP. Continue Reading
-
Watch out for asymmetrical routing
Asymmetrical routing can cause trouble that's tough to diagnose. Continue Reading
-
Enable the hookflash relay
How to enable it. You'll need it. Continue Reading
-
VoIP user experience questionnaire
VoIP user experience questionnaire Continue Reading
-
Tune spanning tree for VoIP
Tuning settings to account for the vagaries of spanning tree protocol. Continue Reading
-
Testing VoIP connectivity on IOS
An undocumented command that makes testing easy. Continue Reading
-
Private line automatic ringdown
How you can connect two phones to one another exclusively via VoIP. Continue Reading
-
Check for full duplex capability
How to find out if hardware supports full duplex record and playback. Continue Reading