Abstract.

This document describes the steps necessary in order to get rid of the telephone line Telecom, from the relative fixed bill and the bimonthly without to lose just the telephone number and continuing to normally telephone with the same telephone but routing telephone calls via Internet through the Voice over Internet Protocol, VoIP.

VoIP is not Skype^®.

Always more often I find myself to having to explain to friends and customers as they can eliminate the telephone bill Telecom completely using the VoIP.

Before what that I feel myself to answer is nearly always: "ah, I have already felt to speak about Skype^®". For which me it is of obligation one short premised: "VoIP is not Skype^®". We repeat all together: "VoIP is not Skype^®".

Skype^® is a software for computer that allows to carry out one called vocal with others makes a subscriber Skype to you^® and, through a called system SkypeOut^® to execute calls also towards makes a subscriber you of the usual telephone lines.

Therefore Skype^® always previews an ignited computer, a microphone and caps connected to the computer and use it of keyboard and mouse in order to begin one called beyond to one type logon xDSL.

You will be of agreement with me that this is not what, in the common sense, telephone call re-enters in the term "to carry out one".

Moreover although Skype^® and its protocol of communication is, technically speaking, a shape of voice over IP, I do not want to number Skype^® between the VoIP systems "user-friendly" for one series of reasons:

• Skype^® necessity of a computer in order to work and is therefore more complex to use than other systems;

• Skype^® is not based on an open protocol but but on a closed protocol and therefore it is not possible to exactly know the emergency and the way in which the our voice it travels using this protocol;

• Skype^® is based on a concept of peer-to-peer between the computers of the net to the par of the software of rows sharing Emule type and therefore our "telephone call" crosses the computers of other Skype customers^® who could therefore intercept it;

• the information approximately the operation and the flow of the data transferred from Skype^® are secret and therefore it is not very clearly where our voice goes to end before reaching the adressee.

For this I will not deal of Skype^® in this document but of those VoIP systems that do not need, in order to only work, of a computer but that they work using the classic house telephone.

From what a VoIP system is composed practically.

A VoIP system is composed substantially gives

Classic modality of VoIP connection

(Source: Quick Install Linksys PAP2 - Copyright © Cisco System, inc. 2004)

• a line of connettività Internet of type ADSL on which our voice will travel, usually codified and compressed gives of the software said codec;

• the router to which it is connected, on one side cable ADSL and from the other our inner net ethernet;

• a ATA (analog telephone adapter), that is an adapter between the net ethernet and the usual telephone net.

• Our telephone of house.

The ATA is the heart of the VoIP system. It on one side concurs to attack itself to the net ethernet having a classic connector female RJ-45 on which therefore connecting the router, from the other to attack our telephone system standard having also a classic plug telephone RJ-11.

Connection between ATA and telephone (Source: Quick Install Linksys PAP2 Copyright © Cisco System, inc. 2004)	Connection between ATA and ethernet (Source: Quick Install Linksys PAP2 Copyright © Cisco System, inc. 2004)

It is that the then authentic ATA and is conversed with the serveur of the supplier of the VoIP service to which we are makes a subscriber to you, in order to obtain the line, to instradare telephoning, finding the residual credit opportunely and cosi via. In order univocamente to identify us to the inside of the system of the operator, the ATA is shaped with an opportune username and password to we it assigns to you.

Schematizzazione of a VoIP system

From the point of view of the "housewife of Voghera", to the used telephone up to now it comes "replaced" the same null telephone that is changes. A beautiful advantage regarding Skype^®.

The only thing that it changes is that, more or less hidden from some part, to mount of the telephone system there is the ATA that, instead of instradare the long telephone call the old analogic line telephone, sends it via Internet to the serveur of the supplier with which we have made the VoIP subscription.

Relatively to the supplier of the VoIP service from here in then, relatively to the characteristics and the costs of services VoIP and ADSL I will make reference to the proposals offered from the company near which job and in particular to firm the SERVIZIOVoIP offer remaining that said how much can be applied in the lines generates them also to other analogous offering of other operating ones with equivalent characteristics.

Which are the advantages of the VoIP?

The VoIP replaces in transparent way the telephone line of house allowing to call all the numbers of fixed and mobile net comprised the emergency numbers, using the same telephone apparatus.

Connection between VoIP and telephone net standard

(Source: www.serviziovoip.it - Copyright © Micso S.r.l. 2005)

The costs of a VoIP telephone call are from 5 to 10 times lower than those traditional ones. As an example, for the long-distance calls Tele2 it costs 6 cent of euro to the minute, one called VoIP 1,7 therefore 70% less (source www.serviziovoip.it 13 November 2005). On the VoIP line, like saying, not there is canone fixed to pay if that one of classic line ADSL but, obviously, line ADSL does not come used normally also for the navigation for which this canone it is a canone that logon to wide band to Internet would be had in any case for having one.

The calls intra-VoIP that is to the inside of the VoIP net of a same operator are free, therefore if the two make a subscriber to you they have a VoIP logon with a same operator the calls between the two makes a subscriber to you are totally free.

There e' always the back of the medal.

Which are the disadvantages of the VoIP? To the state they of the technology puts into effect does not work the fax (tant' is that for this there is a called protocol to-hoc foIP, fax over IP), and finishes them to POS and all those systems that they try to be connected as an example via modem like the logons dialup to the several freenet.

This limitation is due to fact that ATA not recognizing calls fax, POS and in a generalized manner modem from those of voice pure, applies to first codec that, if in the case of the voice, substantially does not alter "the vocal" information of the call, in the case of modulation-demodulation of a modem of it it destroys instead completely the informative part.

To part however this limitation, in many cases marginal, the VoIP is therefore substantially identical to the traditional analogic telephony and, like such, a good candidate to being the telephone of the future.

The enormous advantage of being able to continue to use the usual telephone apparatus allows to avoid "gap" due to the income of one the new technology with new instruments with which the citizen it must be become accustomed and it avoids of the costs added to you that they would be instead necessary in the case of the introduction of new apparatuses.

As Telecom is removed.

We begin, to this point, to enter in the alive one of the speech and to see which they are the passages necessary to carry out in order to remove Telecom, not to lose the number of telephone currently in use and to pass to the VoIP.

We consider therefore a family type that still does not have an Internet connection to wide band but traditional telephone line possesses one and a number of geographic telephone 012 345678.

Having already active a telephone line it could be thought to activate the ADSL on which then using the VoIP on this same line. The thing is sure possible but it would then prevent us to eliminate the telephone bill. If in fact it is technologically possible to activate the ADSL on a usual telephone line and then to remove the contract voice and the relative bill, Telecom does not preview commercially this possibility in the sense that if active an ADSL on a line and then is tried to interrupt the service of fonia disdicendo the relative contract, Telecom removes also service ADSL although the two contracts are separate to you.

[ Modernization of 28 November 2005 ] E' news today that, with a famous one on the just situated one, Telecom it has declared that from 13 December 2005 it will be possible to disdire the service of fonia without that the eventual ADSL of an other already present operator comes retracted on the line. In this case the line will automatically become one line "ADSL connection without fonia" no-phone. If this were true, would come to fall the speech of which under relatively to the necessity making a new contract of one new line no-phone in how much, to the action of the notice to leave of the line of fonia, our "only one" to this point, line would become automatically no-phone. Obviously it remains in feet all the remaining speech. We will be to see if and in that modality this will answer to the true one. We return to our speech. Eye that also in this case, the notice to leave does not go given endured and directly but goes continuation the procedure under didelegare the supplier of the VoIP service to the notice to leave of the line of fonia.

For our scopes it is therefore necessary (less of the famous one than modernization of which over) in any case the activation of one new line. To the cost of ? 99, a tantum for the activation, can be obtained an ADSL on one new line on which it is not active and it is not possible to make fonia traditional and on which passes single traffic ADSL.

What it practically happens, to the purchase of a contract no-phone, is that after some day, omino a Telecom comes and installs a new subscriber loop to house ours. Telecom comes why monopolista company as far as  the last mile is she still it that is the piece of thread between house yours and it centers it them telephone. Therefore, independently from the operator with which you have stilato the contract no-phone, Telecom comes to carry the thread. Obviously no cost goes had to the "omino" in how much already included in the 99 euro of activation that exactly serves to cover the costs of activation of the line.

It is true, exist currently other operating ones that, in some zones of Italy can carry the thread to house directly without to pass for Telecom but on these lines then it is possible to only put the ADSL of the same operator. As an example if I have a Fastweb line I can only put the ADSL of Fastweb, if I can put a Albacom line I can put only one then ADSL Albacom. Indeed a friend told that he to me, having Infostrada, an other operator who in some zones covers the last mile, then it was not successful neanche to having the ADSL from Infostrada and however he had had to take one line no-phone from Telecom.

Instead that Telecom door is a line for cosi to say "neutral" on which whichever operator it can activate an ADSL or best to you, to the contrary, when a whichever operator wants to activate one ADSL on one not-telephone line, Telecom door that "neutral" line.

To this point we have a plug identical to that telephone (RJ-11) on which it comes activated the ADSL from the operator with which we have stilato the VoIP contract and we are therefore in the condition of a line on which we can only make fonia, that one that already we had, and on which we pay canone the relative Telecom and releases you to our telephone conversations and a second line, that one as soon as installed, on which we pay a canone for service ADSL.

The ready operator is hour to activate the VoIP service on our line ADSL. He comes us therefore supplied a new number of telephone, a ATA and a username and password, inside to the ATA that he identifies to us with the VoIP operator like customer X.

We are hour in degrees to make and to receive calls using the single VoIP service to pact to have recharged our telephone. In fact, usually, the VoIP system works with the same logic of the reloadable cards of the cellular ones. A online is recharged tot of credit through a page type this, and a tot is had therefore to disposition of credit for the telephone calls.

We are hour ready to finally say goodbye to the "old beloved Telecom".

Through the appropriate module dedicated to the cosi said service of "service provider portability" we delegate the VoIP operator to disdire, for our account, the old telephone line Telecom and to the transfer of the old number in the new system.

Time a week approximately the game is made. The old line becomes "dumb" and the telephone calls to the old number begin to be received on the telephone connected to the VoIP.

Obviously this described is the more general case. In the case, as an example, some Telecom line is not possessed is always possible to activate one subsequently ADSL on one line given no-phone and the VoIP. Obviously it does not exist "number portability" not existing a number to mount "to carry".

It does not remain that to scream : "Goodbye old Telecom, long live to VoIP".