On peut être passionné par la téléphonie et prendre soin de soi : "Faites du sport, faites du vélo" est la devise du site d'e-commerce lancé par l'un des auteurs de Panoramisk : bikeo. Si vous faites du vélo, que ce soit en ville, sur la route ou sur les chemins plus accidentés, n'hésitez pas à aller faire un petit tour sur www.bikeo.fr pour vos prochains achats verts.
En plus leur plate-forme de téléphonie utilise Asterisk, comme quoi on peut la convergence est une réalité.

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1. Do you already have a telephony system?
2. Is your IP network ready for voice?
3. Do you have analog equipment or lines?
4. Is your voice installation split on multiple location?
5. Are you using wireless phones on your system?
6. Do you need a call billing feature?
7. Are you planning an outsourcing process of the telephony system?
8. Does telephony needs to be linked to computer systems?
9. Are you planning to exchange voice over IP traffic with telcos or partners?
10. Are you using a call-center?
11. Are you monitoring or recording your phone calls?
12. Are you using a automated call system?

3- Do you have analog equipment or lines?

Analog lines have always been nightmare in the IP world. This is mainly the case because application running over analog lines could be non human ones, like fax, modems or specific equipment. In the past, the PBX was a central point on which every phone was directly connected. In IP telephony the model is distributed, each IP phone or equipment is autonomous and try to exchange traffic directly with the other phone or telephony component.

In a transition phase from traditional to IP telephony, we will try to upgrade analog phones to IP ones, but managing fax and modems is a bit difficult. First, they are not moving, this means we should have an Ethernet port available near their location to connect these to the IP world. Second, we need to use a specific adapter (analog to voice over IP) that delivers the 48V power and convert analog to digital, this needs to be done for each analog device (fax, modem, remote control, alarm, monitor, …).

On top of this, the voice signal should be transported without modification, this is really important in a fax or modem application, less in a voice application where the human ear can interpret more easily the received signal. The chosen codec should be as reliable as possible, G.711 is a good candidate since not changing the signal during analog to digital conversion.

If a lot of analog devices need to be connected to the IP telephony system, we could use a multiport analog to digital converter located at a central cabling point and reuse the old cabling infrastructure. Such products are available on the market and propose enough analog ports to fill an E1 or T1 equivalent (up to 30 lines), which should be enough in most of the cases.

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