Drawbacks

VoIP technology still has a few shortcomings that have led some to believe that it is not ready for widespread deployment. However, many industry analysts predicted that 2005 was the "Year of Inflection," where more IP PBX ports shipped than conventional digital PBX ports.

Faxes
One drawback is the inability to send faxes due to software and networking restraints in most home systems. However, an effort is underway to define an alternate IP-based solution for delivering Fax-over-IP, namely the T.38 protocol.

Internet Connection
Another drawback of VOIP service is its reliance upon another separate service - an internet connection. The quality and overall reliability of the phone connection is entirely reliant upon the quality, reliability, and speed of the internet connection which it is using. Shortcomings with internet connections and Internet Service Providers (ISP's) can cause a lot of grief with VOIP calls. Higher overall network latencies can lead to significantly reduced call quality and cause certain problems such as echoing.

Power Outages
Another drawback of VOIP is the inability to make phone calls during a power outage, but this problem also exists with many phones used with conventional land lines and can be remedied with a battery backup.

If VoIP is used in solitary LAN (with no internet connection), it would consume more resources compared to a PABX.

Voice over Internet Protocol, also called VoIP, IP Telephony, Internet telephony, Broadband telephony, Broadband Phone and Voice over Broadband is the routing of voice conversations over the Internet or through any other IP-based network.

Protocols used to carry voice signals over the IP network are commonly referred to as Voice over IP or VoIP protocols. They may be viewed as commercial realizations of the experimental Network Voice Protocol (1973) invented for the ARPANET.

Voice over IP traffic can be deployed on any IP network, including those lacking a connection to the rest of the Internet, for instance on a local area network.
Advantages

Cost
In general, phone service via VoIP is free or costs less than equivalent service from traditional sources but similar to alternative Public Switched Telephone Network (PSTN) service providers. Some cost savings are due to using a single network to carry voice and data, especially where users have existing underutilized network capacity they can use for VoIP at no additional cost. VoIP to VoIP phone calls on any provider are typically free, whilst VoIP to PSTN calls generally costs the VoIP user.

There are two types of PSTN to VoIP services: DID (Direct Inward Dialing) and access numbers. DID will connect the caller directly to the VoIP user while access numbers requires the caller to input the extension number of the VoIP user. Access numbers are usually charged as a local call to the caller and free to the VoIP user while DID usually has a monthly fee. There are also DID that are free to the VoIP user but is chargeable to the caller.

 The 4D Talk business VoIP service has been unveiled by 4D Internet Ltd, a communications company based in the UK, providing a replacement for existing small PBX or FeatureLine installations for managing and routing calls.

The service provides businesses with a telephone adaptor enabling them to use their usual BT/analogue phone over any broadband Internet connection, using advanced VoIP technology without needing to make calls via their PC.

According to 4D Internet Ltd, the service enables VoIP calls to be made for less than the cost of standard calls made via BT, a UK telephony services provider, while avoiding the need to use traditional voice services for inbound and outbound calls. Features offered by 4D Talk include voicemail, caller return, caller display, caller ID blocking, address books, number blocking and call waiting, with fax2email and non-geographic numbers services offered to businesses.

Calls made with the 4D Talk business package to other 4D Talk users are free of charge and the service is suitable for companies using up to eight analogue lines. An unlimited 2Mb/s business broadband and business VoIP is being offered for GBP49.99 per month rather than the usual GBP69.99 per month as a special launch offer, for companies signing up by 30 June 2006.

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VOIP IS BIG NEWS FOR growing businesses. The cost savings, convenience and features are well-known, but there are a few drawbacks that you should be aware of. The good news is that many of these issues can be dealt with through proper planning and implementation.

"The biggest downside is reliability. [VoIP] requires smart network design," says Robin Gareiss, principal research officer with Nemertes Research (www.nemertes.com), a New York City tech research firm. Gareiss has been studying VoIP and listening to business concerns as the technology becomes mainstream. Businesses must have power over Ethernet capabilities and a large enough UPS to handle the combined data and voice network. If the power goes out and you don't have a proper UPS, your phones can go down. Fortunately, you can save by investing in one large UPS rather than in two smaller ones for voice and data.
Another concern is the lack of 911 services from VoIP phones. This is a problem for employees using IP softphones from home or remote locations. "It's not as huge of an issue as it seems," Gareiss says.
Yet another potential problem spot is not being included in the local phone book. An easy solution to this advertising issue is to hang on to a traditional phone line for backup purposes.
Concerns about call quality have dissipated. Gareiss says problems in this area are usually the result of poor implementation that can be avoided by setting up your VoIP network correctly in the first place.
VoIP spam is also beginning to rear its head, so watch for ways to deal with it proactively as they develop. All these issues are worth keeping an eye on. Smart planning and advances in the technology will help minimize the risk.

Australian telecomms companies are calling for a new dedicated numbering scheme for VoIP services, but the companies have yet to agree over the technical details, and smaller carriers are worried that the scheme could be uncompetitive.
The proposal was submitted to the Australian Communications Authority in response to the ACA's public discussion paper on VoIP regulation that was issued in October 2004. Australia's leading telecomms company, Telstra, has called for a new numbering system that differentiates between VoIP services that meet current Standard Telephone Service obligations and those that don't.
Australia's Competitive Carrier's Coalition (CCC), which represents second-tier telecomms companies, said however that it believes that treating VoIP services as a third call type between fixed and mobile services would cause problems, and that a separate numbering system would affect fair competition in the market.
Emergency services have also voiced their concerns over unregulated VoIP services that could damage emergency service hotlines, with telecomms companies only wanting to help them when it is in their economic interest to do so, reports ZDNet Australia.

 US telecomms company AT&T has announced a series of new features that it claims will strengthen its VPN and VoIP offerings.
AT&T said that it is introducing a new real-time 'hoot and holler' conferencing capability, creating a conference bridge with multicasting IP technology. The company has also introduced an 'automatic ring down' feature that allows two phones to be instantly connected by just lifting the receiver.
The company has also announced that its Voice of VPN customers will now receive free off-net calls to all US and non-US locations for the next 60 days. A spokesperson for AT&T said that its aim is to allow customers to maximize the value of their virtual private networks and their inherent security, by unlocking the productivity benefits of VoIP.

A new guide to adopting Internet telephony has been released by publisher O'Reilly, aimed at IT professionals such as IT managers, network engineers and systems administrators.
According to Ted Wallingford, author of 'Switching to VoIP', there are hundreds of thousands of Voice over Internet Protocol (VoIP) devices in use in the US today. He said the next step is for the Internet to replace the current global telephone network, and the book details ways to integrate an IP-based voice network with existing telephony systems.
Wallingford stated that VoIP reduces cost and centralises administrative control, claiming that VoIP appeals especially to businesses with enterprise networks. He has however warned of possible drawbacks and in 'Switching to VoIP' covers the most common reasons for VoIP migrations failing. He said the book answers questions about equipment and protocols, without the influence of sales pitches from IP vendors.
Research has shown that up to two-thirds of the USA's 230 million landline telephones are to be replaced by VoIP within the next ten years, O'Reilly said.

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