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Occasionally, I have run into the issue when turning up a PRI that ring back is not heard when placing an inbound call. Caller only hears silence until the called party answers. This seems to be more prevalent with smaller Telco’s who don’t have a lot of experience with PRIs.

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Last week, I was part of the Gestalt IT Network Field Day in San Jose, CA. You may have noticed a lot of buzz on twitter and blogs. The purpose of the Tech Field day is to bring independant people active in the networking community together with vendors to discuss products, ideas, technologies and most important Networking. Not only Networking in a technical sense but also networking in terms of people. (more…)

This tutorial is a continuation of the virtual voice lab series. Unfortunately, the virtual voice lab has been a “work in progress” much longer than I had hoped it would be when I started it two years ago. In this tutorial, you will add a new router to your GNS3 topology. It will connect it to the HQ, BR1 and BR2 routers to simulate an Internet connection and the Public Switched Telephone Network (PSTN).

There is one caveat to this PSTN simulation… GNS3/Dynamips is not capable of simulating traditional analog or digital circuits. We will be simulating an Internet Telephony Service provider (ITSP). ITSPs have become increasingly popular in the past ~5 years. Basically, the PSTN router will route incoming calls to the branch routers and received outgoing calls from the branch routers over a SIP or H323 trunk.
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