Kolmisoft Blog

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

Introducing the new client Support portal

Same tickets, servers, payments, and product votes. A clearer home screen, light and dark themes, and less hunting through menus. Kolmisoft clients already work...

Mindaugas Kezys
Oct 12, 2026 3 min read

Your partner’s invoice and your CDRs disagree

The supplier PDF is 570 EUR above Last Calls for the same month. Finance wants to pay or to withhold. Pair their call file...

Mindaugas Kezys
Oct 5, 2026 4 min read

How VoIP providers get drained in 30 minutes

You open Last Calls on a Monday and a prepaid balance is gone. Or a postpaid account with unlimited credit spent half an hour...

Mindaugas Kezys
Sep 30, 2026 5 min read

Introducing CDR export files on the server

A template export can stay on the server. You download it from CDR export files, and the email carries a link. The archive is...

Mindaugas Kezys
Sep 30, 2026 6 min read

Why a dialer gets 503s when channels are still…

You start a predictive campaign. The trunk still shows free channels. A second later the dialer log fills with SIP 503 and congestion, and...

Mindaugas Kezys
Sep 30, 2026 5 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...

Mindaugas Kezys
Sep 29, 2026 4 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 one second than a small office places in a morning.... Read More

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 window at the same time. These businesses serve different customers,... Read More

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 on M4. At peak they ran about 30 million calls... Read More

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