Telecom infrastructure for builders.
Wholesale phone numbers in 50+ countries, A-Z voice termination, an AI dialer that picks up when the team cannot, and end-to-end infrastructure support.
$ curl https://api.c0.lt/v1/numbers/buy --data country=LTProducts
One team in Vilnius behind every layer of the stack.
Wholesale DIDs in 50+ countries: local, national, toll-free, mobile. API or self-service.
A-Z wholesale termination with CLI-guaranteed routes and MOS-monitored quality.
Outbound and inbound AI calling. Books meetings, qualifies leads, triages support.
Comms-systems development and end-to-end operations: PBX, SIP, monitoring, on-call.
Our sister product for small businesses and families. Managed PBX with AI agents built in.
From the blog
Notes from the team running this stack.
Setting up wholesale DIDs across 50 countries
What changes when you move from a single number-provider account to a multi-country wholesale setup - and the boring rules every regulator cares about.
A-Z voice termination, explained without jargon
Carriers, routes, CLI tiers, and why wholesale termination is more boring (and reliable) than it sounds.
An AI dialer that books meetings, not a chatbot that wastes them
What separates a useful outbound AI agent from a frustrating one - and why latency, not the LLM, is the real bottleneck.
Talk to a human in Vilnius.
Email hello@c0.lt or call +370 5 214 1515. We reply within one Vilnius business day.
Open the contact form