Kolmisoft Blog

Freeswitch installation on Debian 11

A short, step-by-step guide for proper installation of Freeswitch on Debian 11 (bullseye) The official instructions are barebone, so this guide is a supplement...

Mindaugas Kezys
Jan 19, 2022 2 min read

The causes of No-Audio and One-Way-Audio VoIP Calls

What is it? Quite a common problem, when a voice call is successfully completed, but the voice packets only successfully travel in one direction,...

Mindaugas Kezys
Jan 3, 2022 3 min read

A2Billing still runs in 2026. Support is what operators…

Operators run A2Billing on live traffic. ICT Innovations, in a June 2026 roundup of open-source VoIP billing, wrote that the project “still works and...

Vilius Stanislovaitis
Jan 3, 2022 4 min read

2022 January Update

Quick update about the work we did last month. Support work-flow updated Changes to our Support System: We are working on some huge improvements...

Mindaugas Kezys
Jan 3, 2022 1 min read

Which Routing Model to use?

We have many routing types and algorithms to choose from. Which one should we use, and when? What criteria determine the best routing model?...

Mindaugas Kezys
Dec 16, 2021 3 min read

2021 November Update

Quick update about the work we did in 2021 November. Product Development work-flow updated We have implemented a system to handle custom development requests....

Mindaugas Kezys
Dec 1, 2021 51 sec read

High-Availability, Redundancy and Fail-Over

It’s never a matter of if a system goes down. It’s always a matter of when. (SysAdmin wisdom) High Availability Computational environments designed to...

Mindaugas Kezys
Nov 25, 2021 3 min read

2021 October Update

Quick update about the work we did in 2021 October. 2FA Implementation Security improvement to help you protect your system using 2FA ...

Mindaugas Kezys
Nov 1, 2021 1 min read

Quality Based Routing

Description Quality based routing represents an advanced type of traffic routing. Based on historical data, the system calculates route quality based on a predefined...

Mindaugas Kezys
Oct 13, 2021 4 min read

Origin-based rating: two prices, one prefix Suppliers list prefix 356 twice on a Malta deck. You pay one price when the caller is inside the European Economic Area. You pay the other when the caller is outside it. Load a... Read More

Your minutes and theirs will not match Same call, different billed seconds. A billing increment mismatch (60/60 vs 1/1) is the usual cause. Compare one CDR before the monthly dispute. Read More

Calls per second vs concurrent calls Calls per second and concurrent calls are separate trunk limits. A dialer can hit the setup rate while the channel count is still low. Read More

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