Voice

PBX, in Italian “centralino”

When I was 8 years old I ran a mini analog Phone Branch Exchange at home.

I was really passionate about Ericsson MD110, one of the most advanced Digital PBX at that time.

I had the chance to put my hands, as a 12 years old boy, on a Cisco 1701 ADSL router.

The summer before I started attending liceo classico, high school, I gained experience with linux and setup an Asterisk PBX. Asterisk is an awesome opensource PBX that I still run at home. This way I learned to love and use linux: create interactive voice appliance with MYSQL and PHP to filter spam calls, select certain Caller IDs etc…

Other things I tested on my voice home lab: Cisco CUCM, CUBE, Skinny protocol etc.

Registered tons of SIP phones on asterisk, a recap of the most challenging ones: Cisco 79xx,88xx ,Avaya 96xx

SIP Protocol My dream was to connect digitally to the PSTN carrier. I would have bought an ISDN line but my parents didn’t let me do that, so a cheap Betamax SIP trunk was the way to go.

Perceived voice quality and overall stability was poor, the root cause was an inadequate ADSL line. From that time on I began to study IP networks, starting from SIP protocol and then down to all layers and architectures.

I abandoned studying voice.Last thing I dived into is IP Multimedia Subsystem and voice interconnections , mainly IP, between carriers.