Comments on: Not your father’s VoIP

By: Anthony Garvin

Anthony Garvin — Sun, 05 Aug 2007 18:37:45 +0000

VOIP Technologies Unzipped Article Archive consist of voip articles, voip products, and more.

By: Peter Morton

Peter Morton — Wed, 07 Jun 2006 10:11:42 +0000

See http://www.ja.net/development/voip/skype&janet.pdf for more information on how skype works. And what supernode means.

By: solarix

solarix — Wed, 04 Jan 2006 10:32:21 +0000

carriers will keep on building the infrastructure to provide IP phone users which DSL/T1 lines, and charging for it (will UMTS take off?)

(Telefonica has just set a $30 bn IPO over O2)

By: George

George — Sun, 20 Nov 2005 21:04:26 +0000

SIP sounds good. However, my first intro to voice over internet is an invitation from a friend to Skype. "Free" often means "Scam".

Does anyone know if Skype is safe to use or if it will slow my computer appreciably?

Appreciate any advise.

By: Maddy

Maddy — Mon, 11 Jul 2005 08:42:21 +0000

Comments on comments – Mr Blog is absolutely right. Skype is an island – albeit a growing island. Their business model, as far as it is possible to ascertain is based on getting as many subscribers as possible and then pushing them services that they will charge for (ref: google and yahoo). VoIP telephony based on SIP would be much more interoperable and would enable new entrants in the e.g. handset market. Currently a Skype handset has to have Skype s/w. With VoIP SIP handsets, the coast is clear for all handset manufacturers and interoperability tests become much, much simpler and faster – which leads to rapid turn around of technology and on goes the cycle.
If Skype were to start looking at SIP, however, the situation would start becoming much more interesting …

By: Arioch

Arioch — Thu, 30 Jun 2005 02:57:20 +0000

2Paulo Pereira :
http://www.telphin.ru/numbers.php
http://www.sipnet.ru/rates/

The movement began

Ooohhh, i wish there would be at last SIP-over-XMPP standard, so i could see phone icon in my messenger, like ICQ5 users

By: RM

RM — Mon, 24 Jan 2005 12:27:06 +0000

Just to clarify my previous post, SIP is being adopted as part of the IMS (IP Multimedia Subsystem).

Whilst not physically part of the SS7 network, it is where much of the convergence currently occurs. SIP based services will however effectively be made available to MSs (Mobile Stations; phones, GPRS cards etc) and internet enabled SIP PUAs (Presence User Agents).

I still believe that WiFi coupled with VoIP will crush the telco's current business models. This is innovation through the introduction of IP into all layers of the network. Mobile networks are made up of many different subnetworks including the Radio Network (RN), the SS7 network and the PSN (packet switched network (usually an IP network for GPRS services etc...).

IP and WiFi should simplify this whole picture by unifying them into one network, with a single routing model etc... The telco's have much to lose.

By: RM

RM — Mon, 24 Jan 2005 11:38:24 +0000

SIP is being adopted by the major (mobile) telecoms companies, inside their SS7 networks.

Currently its adoption is not for VoIP calls or anything that would compete with their business models, but comes in the form of a presence service.

The 3GPP (3rd Generation Partnership Project), a standards body for mobile network, define a SIP based presence service in 3GPP TS 23.141. This loose specification still leaves elements undefined but can be found on their website at http://www.3gpp.org/

There is a huge push coming for network convergence (between the IP and SS7 networks). The mobile companies have a lot invested in the complexity of the SS7 networks and don't want to replace them with IP just yet.

I believe that the move to IP will slowly happen, first with convergence and then with SS7 being replaced.

Quite how quickly VoIP will make the operators move is unknown. They need a business model before they'll take the jump.

By: Sur Abyr

Sur Abyr — Mon, 27 Dec 2004 19:51:04 +0000

Technically only end users who install Skype are not allowed to reverse engineer the protocol. As a network administrator, you should have full rights to rip this anonymous data stream apart and figure out how it works. It’s not like they can put a license on every data packet.

That’s my logic anyway. I just started tracking how it works on my wife’s machine. As you said rune – it’s my wires. Any programs using said wires are subject to examination. Use of wires implies acceptence of terms.

By: rune

rune — Tue, 09 Nov 2004 11:26:40 +0000

How can we not be allowed to reverse engineer a protocol passing over our own networks. It’s my wire, I want to know what on it )