ENUM or “peer-to-peer” IP telephony
You are now an IP telephony user and have installed an Asterisk. You are using an IP Centrex link to a SIP or IAX operator. Go to the next level with peer-to-peer telephony with ENUM.
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Analyzing VoIP with Wireshark
When working in the IP telephony world it is crucial to know how to use a network analyzer, in order to understand how the traffic is circulating over the network. This article presents some interesting Wireshark features related to voice over IP protocols.
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Client registration using SIP: REGISTER
Registering a client in the SIP model is not mandatory, a session can be initiated with a peer without requiring a lookup in the SIP directory. But why is this method so important and how does it work? This article explains what is a registration in the SIP world and how it works with Asterisk.
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Test of the 3CX Phone System free edition
A PBX system on a Microsoft Windows operating system? Yes it is possible and 3CX with its Phone System is proposing such a solution. After some tests on the free edition, here is our analysis.
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IP Centrex: using international numbers
One of the interests of IP telephony is the fact the Internet can become a network to carry telephony for some usages. We cannot consider today this network is offering a high grade quality but its ubiquity is incredible and no telco can nowadays be compared on this topic. It becomes relatively easy to imagine using a foreign ToIP operator in order to access specific prices in this country on one hand and be able to accept calls with a local number on the other hand.
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