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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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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Network transit and peer qualification
Transit delay on the IP network is a real issue when pushing voice communication on top of it, it really affects quality and comfort of users. We generally consider that a delay above 150 ms becomes sensible to human ear and above 400 ms is considered painful1 and forces users to apply delays before starting a new sentence. With Asterisk, it is possible to verify if the round-trip delay is compatible with the service quality we would like to achieve on our telephony over IP network: it is called qualification.
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- remember satellite calls [↩]
