VoIP and IP telephony
A strong unified communications strategy starts with voice technology. Explore all facets of enterprise telephony, including hardware and devices, architecture, and standards and protocols like SIP and H.323.
Top Stories
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Tip
11 Sep 2025
Navigating 911 compliance in the hybrid workplace
Companies find it challenging to comply with 911 regulations. Learn how you can minimize risk and ensure your workforce remains safe. Continue Reading
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Quiz
05 Sep 2025
Test your knowledge of E911 compliance requirements
Compliance with E911 regulations must be a core part of an organization's phone system strategy. Take this quiz to see how well you know E911 compliance requirements. Continue Reading
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Answer
05 Mar 2013
Are there advantages to using the public switched telephone network?
You may have to sacrifice some advantages of the public switched telephone network if you switch to VoIP, says telephony expert Jon Arnold. Continue Reading
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Answer
19 Nov 2012
How does VoIP performance differ over LAN, WAN and other networks?
Environment affects VoIP performance, so it's important to consider how VoIP best fits in your environment is important, our UC strategies expert explains. Continue Reading
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Answer
03 Aug 2010
The value of toll bypass in the enterprise
IP telephony expert Jon Arnold explains the value of toll bypass in an IP telephony setup, detailing why enterprises should consider it as an option while tempering cost-savings expectations. Continue Reading
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Definition
07 Mar 2008
hairpinning
In general telecommunication, hairpinning is returning a message from an origin endpoint back in the direction it came from as a way to get it to its destination endpoint. Continue Reading
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Answer
22 Jul 2007
What can a VoIP phone do that a landline phone cannot?
This expert response outlines the basic differences between a VoIP phone and a POTS phone. Continue Reading
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Tip
05 Mar 2007
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
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Tip
12 Feb 2007
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
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Tip
22 Jan 2007
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
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Tip
07 Jul 2005
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