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Giovanni Tommasini

Giovanni Tommasini

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Enthusiastic Seeker. I love to constantly improve my freedom; I love challenges and I like to keep improving myself in personal life as in work.

Linux user with limited permissions

Sep 2, 20223 min read

Quick guide how to create a linux user with limited permissions · The idea and the purpose In this article I want to answer this question: How can I...

Linux user with limited permissions

Asterisk 11.6 and PostgreSQL 13: column d.adsrc does not exist

Apr 6, 20224 min read

cdr_pgsql.c: Failed to query database columns: ERROR: column d.adsrc does not exist" and no CDRs will be logged. · The problem Do you work with asterisk...

Asterisk 11.6 and PostgreSQL 13: column d.adsrc does not exist

VoIP calls and TLS security

Mar 16, 20225 min read

Kamailio in docker container with TLS enabled using Let's Encrypt. · After a while, here I am again, talking about VoIP.The last article is about audio...

VoIP calls and TLS security

VoIP: fundamentals of SIP and related topics  - part #6: audio problems and the quality of a VoIP call

May 9, 20216 min read

In the previous episode I talked about the main tools for working with...

VoIP: fundamentals of SIP and related topics  - part #6: audio problems and the quality of a VoIP call

VoIP: fundamentals of SIP and related topics  - part #5: the main tools for working with VoIP

May 2, 20216 min read

Here we are, close to the end of this mini-series.In the previous episode I talked about the UA PBX, standard configurations and some security tips. ...

VoIP: fundamentals of SIP and related topics  - part #5: the main tools for working with VoIP

VoIP: fundamentals of SIP and related topics - part #4: UA PBX, standard configurations and some security tips

Apr 25, 20215 min read

Here we are with the fourth appointment with the mini-series about VoIP.You can find the last episode...

VoIP: fundamentals of SIP and related topics - part #4: UA PBX, standard configurations and some security tips