VOIP Phone Systems
14 Nov 2008, 10:41 amFirstly we need to understand VOIP before we can utilize this type of telephony. Specific hardware and support is needed to bring this service into effect.
Deffinition of VOIP.
Voice over Internet Protocol (VoIP) is a general term for a family of transmission technologies for delivery of voice communications over the Internet or A VoIP VPN (VODSL). Other terms frequently encountered and synonymous with VoIP are IP telephony and Internet telephony, as well as voice over broadband, broadband telephony, and broadband phone, when the network connectivity is available over broadband Internet access.
VOIP VPN
A VoIP VPN combines Voice over IP and Virtual Private Network technologies to offer a method for delivering secure voice. Australians know this as VOICE OVER DIGITAL SUBSCRIBER LINE or VODSL. Because VoIP transmits digitized voice as a stream of data, the VODSL solution accomplishes voice encryption quite simply, applying standard data-encryption mechanisms inherently available in the collection of protocols used to implement a VPN.
The VoIP gateway-router first converts the analog voice signal to digital form, encapsulates the digitized voice within IP packets, then encrypts the digitized voice using IPSec, and finally routes the encrypted voice packets securely through a VPN tunnel. At the remote site, another VoIP router decodes the voice and converts the digital voice to an analog signal for delivery to the phone.
Advantages of VODSL
Security is not the only reason to pass Voice over IP through a Virtual Private Network, however. Session Initiation Protocol, a commonly used VOIP protocol is notoriously difficult to pass through a firewall because it uses of random port numbers to establish connections. A VPN is one solution to avoid a firewall issue when configuring remote VoIP clients. The VPN virtually moves users inside the same network local as the VoIP server. VODSL is a SSL based VPN service specially designed for VOIP applications. It helps to bypass ISP blocking on VOIP calls utilizing the VPN tunneling technology and assigns mapped static public IP to VOIP gateways for wholesale traffic origination and termination applications.
++++++++++++++++++The most important part of this it is QoS controlled, secure, flexible and reliable. ++++++++++++++++++++++++++
Internet VOIP.
- VoIP can facilitate tasks and provide services that may be more difficult to implement or more expensive using the PSTN. Examples include:
- The ability to transmit more than one telephone call over the same broadband connection. This can make VoIP a simple way to add an extra telephone line to a home or office.
- Conference calling, call forwarding, automatic redial, and caller ID; zero- or near-zero-cost features that traditional telecommunication companies (telcos) normally charge extra for.
- Secure calls using standardized protocols (such as Secure Real-time Transport Protocol.) Most of the difficulties of creating a secure phone connection over traditional phone lines, like digitizing and digital transmission, are already in place with VoIP. It is only necessary to encrypt and authenticate the existing data stream.
- Location independence. Only an Internet connection is needed to get a connection to a VoIP provider. For instance, call center agents using VoIP phones can work from anywhere with a sufficiently fast and stable Internet connection.
- Integration with other services available over the Internet, including video conversation, message or data file exchange in parallel with the conversation, audio conferencing, managing address books, and passing information about whether others (e.g., friends or colleagues) are available to interested parties.
- Advanced Telephony features such as call routing, screen pops, and IVR implementations are easier and cheaper to implement and integrate. The fact that the phone call is on the same data network as a user’s PC opens a new door to possibilities.
- A major issue preventing VoIP’s acceptance by more users is mobility. This is being addressed with new (Wi-Fi)-enabled cordless phones available on the market. With the advent of new technologies such as (WiMAX), it is believed that the mobility issue with VoIP shall vanish.
Internet VoIP challenges:
- Available bandwidth
- Residential grade
- Network Latency
- Packet loss
- Jitter
- Echo
- Security
- Reliability
- In rare cases, decoding of pulse dialing
Integration into global telephone number system
While the wired public switched telephone network (PSTN) and mobile phone networks share a common global standard (E.164) which allocates and identifies any specific telephone line, there is no widely adopted similar standard for VoIP networks. Some allocate an E.164 number which can be used for VoIP as well as incoming and external calls. However, there are often different, incompatible schemes when calling between VoIP providers which use provider-specific short codes.
++++++++++++++++++The most important part of this it DOES NOT HAVE QOS controlled, secure, flexible and reliable. ++++++++++++++++
Connecting Hardware to IP telephony
Now we have the basic understanding of the technology we are trying to harness we can look at the different types of systems available. Arrow only offers VOIP VPN services as we are a Business only provider. Normal digital and analogue services are connected to Arrows VOIP VPN which simple connects to your normal PABX system. From 4 lines to 400 is available to take advantage of the large savings available with this type of technology. Arrow Utilizes Aristel and Alcatel phone systems which gives the perfect hardware solution to terminate this technology. Arrow can also connect multi sites utilizing this technology this takes further equipment linked to the PABX at each site.
for further information contact Us.
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