Kolmisoft Blog

2026 October: Two critical PHP bugs

On 21 October 2026 the PHP project released fixes for two critical bugs, CVE-2026-109618 and CVE-2026-109619. PHP scored each one CVSS 9.2. On a...

Mindaugas Kezys
Oct 22, 2026 4 min read

High Asterisk CPU: find the cause before a restart

Asterisk at 150% or 250% feels like the server is finished. On a host with several cores, that number can be one or two...

Mindaugas Kezys
Oct 21, 2026 14 min read

Introducing Italian, Ukrainian, and Spanish on Kolmisoft.com

Read Kolmisoft.com in English, Italian, Ukrainian, or Spanish. Choose your language on the homepage, then explore softswitches, pricing, and contact pages the way you...

Mindaugas Kezys
Oct 16, 2026 2 min read

Call-center traffic on a softswitch: what operators need

Office PBX traffic and call-center traffic both travel over SIP. That is where the similarity ends. A predictive dialer can fire more attempts in...

Mindaugas Kezys
Oct 14, 2026 5 min read

When your voice business needs more than 1,000 CPS

A wholesale carrier adds a fast-growing originator. A provider that serves outbound call centres takes on more dialling traffic. Several campaigns hit their busiest...

Mindaugas Kezys
Oct 13, 2026 5 min read

How we lost our largest client

We lost our largest client. This is what happened, what we got wrong, and what we are changing. They were a fast-growing wholesale operator...

Mindaugas Kezys
Oct 13, 2026 3 min read

Why carriers regret writing their own billing

You already have Asterisk. You have a few scripts that rate CDRs overnight. Prepaid works for the customers you have today. A commercial softswitch...

Mindaugas Kezys
Oct 13, 2026 7 min read

Which dialer customer burned your CPS route

You carry call-centre and dialer traffic for several customers on the same US or UK termination. One campaign opens at 09:00. Setup attempts spike....

Mindaugas Kezys
Oct 13, 2026 4 min read

White-label hosted PBX: one invoice for many resellers

You sell hosted PBX or UCaaS through partners. Each partner wants their logo, their rates, and their own customers. If every customer sits on...

Mindaugas Kezys
Oct 13, 2026 6 min read

Softswitch migration: match invoices before cutover Billing breaks a softswitch migration: balances, rate plans, the CDR file, and the first invoice. Bill one month of the old call records on the new tariffs, and set those invoices beside the old... Read More

Answer an ITG traceback from your own CDRs An ITG traceback response starts in your CDRs. Search Calls List by time, source and destination, name the Origination Point, and stop that trunk. Read More

What your softswitch can stop in a SIP DDoS attack You run MOR or M4 yourself. By the end you can tell a full pipe from a SIP flood, set the switch controls that limit a flood which reaches the server, and ask the... Read More

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