The router has two WAN interfaces. One is primary and the other one is secondary. Primary interface is a Base T Ethernet (10/100) which is nothing but the connection to the outside world. Secondary WAN interface is used when there is a back up fail-over in the primary one or sometimes used for the bandwidth aggregation and load balancing in the network. Any LAN Ethernet port can be selected and used as the secondary interface. In the absence of second WAN feed, you can use the selected WAN port as a normal LAN port.

The USB port of this router can be used as a WAN interface for a cellular 3G USB modem supporting the advanced ‘HSDPA’ type of networks which can provide a connection speed of about 3.4 Mbps which is far better than the existing GSM cellular (GPRS) systems. You can be able to have broadband connection anywhere in UK without any wired lines. But the SIM and the USB modem will not be given with the router. You need to buy yourself from your GSM Company.

A Virtual Private Network (VPN) is simply a method to transfer the private data with the help of public network (i.e. internet) between branch offices. Actually this router acts as a VPN end point or concentrator to a number of remote sites. Industry standard protocols like PPTP, IPSec etc. are being used by this VPN with greater encryption standards as MPPE, DES and AES. No need of additional licenses for the users.

An enhanced firewall of full packet level facility comes with this router. SPI (Stateful Packet Inspection) along with NAT and non-NAT IP routed modes are also employed. Automatic protection against IP anti spoofing and Denial/Distributed denial of service attacks is available with this vigor 2910. User can also be able to design filters on their own so as to exhibit additional protective criteria. An object oriented system is being employed to design a more flexible filter. In the case of foiled and potential attacks, the user would be intimated through email by the router by making use of sys-log facility. Content filtering facility is also there which abandons the users from using unsecured sites.

Dual phone ports are available with the router for VoIP. With the help of this VoIP, you can be easily capable of communicating with the remote users by means of voice calls with your broadband capacity. The voice calls would be free of cost since the users are purveyed with always-ON ADSL connection. If you have VoIP service in your office or home reveals that you have additional facility for making voice calls without any phone line. You can easily make phone calls world wide in no time. All the features and the functionalities of this Draytek vigor 2910 wireless router make it highly flexible, secured and efficient with comparatively greater network performance.

Wireless networks enable internet connectivity without the use of cables in a specific physical location to a span of few. These networks are also termed as Wi-Fi (Wireless Fidelity). The next era of technology enhancement is to access networks through mobile phones. Such a phone is referred to as WIFI SIP phone. The use of phone would save our telephone bills almost one third. All we require for this device is a simple broadband connections.

The expansion of W-FI SIP is Wireless Fidelity Session Initiation Protocol. WIFI SIP phone uses session initiation protocol to communicate with other mobiles across the globe. The use of protocol is a major advantage. The protocol enables to link the specific server and client (receiving end) in a quicker way. These phones appear similar to VOIP (voice over internet protocol), but they are not exactly the same. Wi-Fi phone uses the SIP to start communications. The WIFI SIP is basically transport independent and text based which makes it easily read by humans. It is also referred as 3GPP signaling protocol. SIP is widely used for video conferencing, streaming multimedia and instant messaging.

The phone must first establish connection to a local Wi-Fi network. The security code is needed to access the net from Wi-Fi hotspots (airports, coffee parlors, pubs, etc) which can be got by getting in touch with the administrator. If it is a free network, then it wouldn’t be a problem. At home, this is easy by simply entering the code that would put you into router.

Once the connection is established with the network, begin sessions with other VOIP devices. The protocol will enable to establish connection, thus making outbound calls through Internet. A software must be installed which would make the WIFI phone to work like a normal mobile phone. There are different kinds of software that is available in market but it would be best to use the software that suits your mobile as in later stage it would lead to problems.

Many people seem to experience lag on the WI-FI SIP phone, but this is due to problem with the network. The concept of working of phones is quite simple. A regular phone transmits the voice signals in analog form. But a phone converts the analog into digital signals and sends signals across the internet as data packets to the wireless receiver. The wireless receiver passes the information to call processor via internet. Throughout the process, wireless receivers are used to locate, initiate, connect and end call. The addresses are very important as they act like direction maps-just like phone numbers for your mobile.

The WIFI SIP phones are great to be dealt with. The outbound local and international calls are practically made free of cost. Whether you call pizza hut or London, it is the same. This is a huge advantage. But, WIFI SIP phones cannot replace normal mobile phones. In mobile phones, emergency calls can be made which is of great help during critical situations whereas in WIFI SIP phones calls, they cannot be done.

Incoming calls can only be got in mobile phones whereas in SIP phones this is a major drawback. For chatting purposes where you don’t like to spend money on telephone bills, it is best to have a phone. In other words, it is a great tool for making outgoing calls. There are different kinds of WI-FI SIP phones are available. These phones are outcome of the latest technology which is mainly focused by the chaps.

]]> http://www.broadbandsuppliers.co.uk/uk-isp/the-wifi-sip-phone/feed/ 0 http://www.broadbandsuppliers.co.uk/uk-isp/sip-phones/ http://www.broadbandsuppliers.co.uk/uk-isp/sip-phones/#comments Tue, 27 Oct 2009 09:38:25 +0000 admin http://www.broadbandsuppliers.co.uk/uk-isp/?p=1648 SIP means “Session Initiation Protocol”. It is a signaling protocol widely utilized for operating multimedia sessions such as voice and video calls over internet protocol. Other feasible application examples include streaming, multimedia distribution, video conferencing, presence information, instant messaging and online games. The protocol can be used for modifying, creating and ceasing two party (unicast) or multi party (multicast) sessions which consists of one or several media streams.

SIP is the most popular voice over IP standard (VOIP). SIP enables two or more people to make phone calls to each other using the INTERNET to carry the call. By using the INTERNET, you gain some distinct advantages over the PSTN (Public switched telephone network).SIP calls on broadbandare digital quality calls across the street and the globe. SIP to SIP calls are always free and calls to old PSTN phones are very cheap with no taxes or monthly charges. Because SIP calls are part of the INTERNET you get great boasts like phone numbers from many places in the world no matter where you live and free voicemail to email.

SIP phone is a SIP service. It is the compounding of all the elements necessary to provide inexpensive, simple and high caliber experience. It works with the hardware manufacturers, the various service providers and even government agencies to make sure you have a positive experience. To use SIP phone you need to have either a hardware adapter or download free soft phone, a broadband connection to the INTERNET, to make free SIP to SIP calls two sides of the call must have a SIP phone adapter or soft phone, to make super inexpensive calls to any of the billions of non-SIP phone (PSTN) phone, you will need SIP minutes, to receive calls on your SIP phone from non-SIP phone (PSTN) phones, you need at least one virtual number.

A SIP user agent (UA) is a logical network end point. It is used to create or receive SIP messages and thereby manage a SIP session.  A SIP phone is hardware or software grounded SIP user agent which performs call functions such as answer, hold/unhold, reject and call transfer. Each source of a SIP network, such as a user agent or a voicemail box, is identified by a uniform resource identifier (URI) based on the general standard syntax also used in web services and email.

The URI scheme used for SIP is sip:. If  secure transmission is required ,the scheme sips: is used and SIP messages should be transported via Transport Layer Security(TLS).In SIP, as in HTTP, the user agent may identify itself using a message header field ‘User-Agent’, containing a text description of the hardware/software/product involved. If the User-Agent field has sent request message means that the receiving SIP server can see this information. SIP network element sometimes depot this information, and it can be helpful in analyzing SIP compatibility problems.

SIP also determines server network elements. Although two SIP end points can communicate without any intervening SIP infrastructure, hence the protocol is defined as peer to peer. It is an important concept that the difference between types of SIP servers is logical not physical. SIP is a text based protocol with syntax same as that of HTTP. There are two different types of SIP messages: requests and responses. The first line of a request consists of a method defining the nature of the request, and a request URI, denoting where request should be sent. The first line of a response has a response code.

The Session Initiation protocol for Instant Messaging and Present Leveraging Extensions (SIMPLE) is the SIP based suite of standards for presence information and instance messaging. During an instant message session, files can be transmitted using Message Session Relay Protocol (MSRP).Some attempts have been made to incorporate SIP-based VoIP with the XMPP specification. Especially, Google Talk, that extends XMPP to support voice, plans to desegregate SIP. Google’s XMPP extension is addressed as Jingle. It is similar to that SIP acts as a Session Description Protocol carrier.

Though you can enjoy numerous advantages by using SIP phone, some disadvantages also exists. SIP’s peer to peer nature does not enable network provided services. The network cannot easily support legally mandated intercede of calls. Emergency calls are difficult to route. But there is a solution to this problem that is burrowing the media packets among TCP or HTTP packets to a relay. This is now implemented in SIP phones to rectify those problems. So without any fright you can use SIP phones and get benefited.

World Wide Interoperability for Micro wave Access or otherwise WIMAX is meant for the mobile broadband service. WIMAX is the latest generation digital telecommunication system with wireless technology which can support all types of transmission modes meant for MANs (Metropolitan Area Networks). The technology is designed based on the standard IEEE 802.16 which can purvey a broadband speed up to 3 Mbps without the cumbersome of wires i.e. the technical features of the communication protocol are given by this 802.16.

The technology can be applied or utilized by the gadgets like latest mobile phones (smart phones), laptops, note books, high tech digital cameras, latest music players, camcorders, some advanced gaming devices etc. It engenders prominent and scalable data transmission of all data formats with lower cost. More or less many features are similar with both Wi-Fi and WIMAX technologies. Anyways they differ in certain functionalities. WIMAX actually varies from third generation cellular technologies.

Wi-Fi functionalities basically target the services of the end users where as WIMAX is purveyed from either licensed or unlicensed spectrum of signals which may not concentrate on end users. WIMAX is purely based on connection oriented protocols where as Wi-Fi supports either connectionless or connection based protocols. With this WIMAX you can be able to get broadband access of about 50 km (30 miles) from the fixed stations and from 5 to 10 km (3 to10 miles) in the case of mobile stations. But you cannot expect such a wide area broadband service in the case of Wi-Fi which lasts only up to some 30 to 100 meters. Naturally, the QoS (Quality of Services) of both WIMAX and Wi-Fi vary.

Since this WIMAX technology is basically a protocol of second generation, you are ensured with an excellent bandwidth, maximum interference avoidance and even with a higher data rate over longer distances. In case of short distances, the bit rate is higher and in the case of long distances, it purveys a lower bit rate. So, you should choose with respect to the requirements of your network. You can achieve this WIMAX facility to your network by getting access from the nearest Wi-Fi hotspots. As a result, portable internet connection is assured with this WIMAX connectivity.

With this WIMAX connectivity, the commercialization and the fostering process of the technology of a business firm is achieved without any hassles or pesters. This latest advancement in the wireless technology engenders the mobile broadband for a number of devices in your network. The performance of this WIMAX is two to three times far better than today’s broadband solutions. Since this WIMAX suits for the deployment of business domains, the technology is most probably implemented for the business processes rather than the residential ones.

To get WIMAX connectivity, you need to install a WIMAX subscriber unit or client unit. It may be installed both indoor and out door depending on the manufacturers. Indoor installment comparatively needs a higher investment than the outdoor ones. To achieve a greater throughput, a higher gain directional antenna of a base station should be located near the client unit. So, it is clear that the rise of WIMAX plays a greater role in the case of MANs.

]]> http://www.broadbandsuppliers.co.uk/uk-isp/the-rise-of-wimax/feed/ 0 http://www.broadbandsuppliers.co.uk/uk-isp/how-to-switch-over-from-one-adsl-provider-to-another/ http://www.broadbandsuppliers.co.uk/uk-isp/how-to-switch-over-from-one-adsl-provider-to-another/#comments Tue, 27 Oct 2009 09:02:41 +0000 admin http://www.broadbandsuppliers.co.uk/uk-isp/?p=1640 The Telecom network infrastructure was started to be built a century ago. Now we have this network span across the longitude and latitude of the globe. We have these lines touching almost every square mile of populated land.

Optical fiber and satellites have filled the continental gaps. They are much faster than the copper cables and are necessary for a realistic conversation at such distances. These underwater and over the sky technologies are keeping up the good work of making the truth that ‘No distance faraway’.

It is true that these telephone lines are no more phones lines for just carrying the voice signals of people talking. They are now the carriers of all kind of data in the name of the Internet. But with the increasing need for more subscribers and more speed what will the poor infrastructure do?

This infrastructure is no magical thing to grow on it’s own as and when the need arises. It’s as difficult and time taking in a huge scale like bringing up a baby. So we can’t scale up the infrastructure immediately, and at the same time we can’t say ‘no’ to the data and info hungry subscribers. What is the solution to this conundrum?

There always is a solution to any problem. All we need to do is find a way to make the existing infrastructure more efficient. Here comes Digital Subscriber Line. This technology uses a high frequency bands. This enables the use of the same infrastructure which means the same copper cables which connected the telephones, but now with more usage.

This is usually Voice Digital Subscriber Line. Voice and the other data are sent through different bandwidth. This enables the primary purpose of the telecom network is fulfilled effectively. Hence the usual talking over the phone will not be affected by any amount of data flow through the same line as the voice has a dedicated bandwidth.

There are two technologies in this Digital Subscriber Line. They are Asymmetric Digital Subscriber Line and Symmetric Digital Subscriber line. In the Symmetric Digital Subscriber Line both the uplink and downlink uses equal amount of bandwidth.

This is suitable for telephonic conversations like video chat etc, where you send as much data as you receive, but in most cases the internet users use the bandwidth other way. In using Internet we mostly tend to get information from the net than send more information to the net. Hence we will be using more of the downlink than our uplink.

It is not effective if we use Symmetric Digital Subscriber Line as we upload much lesser data when compared to the amount we download. Hence we go for Asymmetric Digital Subscriber Line (ADSL). This is the most popular data communication technology we use these days.

ADSL is one of the reasons for bringing in Broadband Internet Access. But there are a variety of ISPs who provide varied qualities of Asymmetric Digital Subscriber Line. We need to choose the right one for our purpose.

Most of these ISPs have their own dedicated modems hence when you need to switch over from one ISP to another you need to buy a new set of connectivity devices for the new ISP you have subscribed for.

It’s generally a little hectic process to switch over from one ADSL to another as it involves a lot of formalities. Usually you need to give a requisition letter to the ISP to withdraw their connection. This must be done preferably before a month, as the request will not be considered until the next bill.

You may very well terminate yourself from your ISP in the middle of your billing month, but the bill amount till the date from the last date billed will be charged. The other problem is your new ISP may not be able to provide you connectivity as soon as expected. This may lead to a period of void during which you may not have Internet connectivity.

For Internet addicts and people for whom Internet is so necessary it’s better to get connectivity from your new ISP before terminating your old ADSL connection.