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CREDIBILITY • VITAL • 2026
BORN 1967 - KOKKOLA, FINLAND
Tero J Takamaa
Founder - The FIN Telecom Oy - fintelco.fi
Private 5G IMS at Rautalampi / Mehtiöjärvi and Hua Hin, Thailand and 6G IMM mediation - built for operators who need real billing to work, not just slides. With a bit of Finnish sisu and a smile.
Tero J Takamaa & fiancé Nalinee Burakhon
Hua Hin - Thailand - 2026 - Private 5G Family
Private 5G IMS at Rautalampi / Mehtiöjärvi and Hua Hin, Thailand and 6G IMM mediation - built for operators who need real billing to work, not just slides. With a bit of Finnish sisu and a smile - and family support from Thailand.
5G IMS - 6G IMM READY
OCDR + TCDR CORRELATION
CHF - OCS - TAP3
S8HR - LBO
HPLMN - VPLMN - VITAL
🇫🇮 Takamaa = 🇬🇧🇺🇸 Backyard - Backyard Tero - From Kokkola Backyard to Global
🇫🇮 Takamaa = 🇬🇧🇺🇸 Backyard - literally.
My surname - In straight translation it might mean "backyard Tero J" - but I am not. - I am Backyard Tero with private cores in Finland and Thailand, not just a backyard guy.
In every Finnish village there is a Backyard Tero - the guy with a bit of scrap in the backyard, a grill shelter and always a project ongoing. My last name is Takamaa - Backyard. The joke writes itself.
But my backyard has:
- Finland HPLMN - Private 5G SA Core - P-CSCF / S-CSCF / MRF / CHF - Rautalampi / Mehtiöjärvi
- Thailand VPLMN - Private 5G SA Core - Hua Hin, Thailand - same stack
- SEPP N32-f - real-time correlation < 1 sec, 2 ms best, 15 min max
- IMS Data Channel - Visual menu on phone without voice connection - MRF-CDR via SIP Call-ID
- OCDR / TCDR mediation - binary to billable - 0% leakage
Not just a backyard - Backyard Tero with private cores. Regular Backyard Tero level is trampoline. Takamaa level is operator. Two of them.
Nordic - European - Middle East - Americas - all done at Nokia.
I have worked at Nokia across Nordic, European, Middle East and Americas regions - with operators and vendors on critical mediation and charging cases, where a small billing gap risk was millions. That is where the learning came from - how real billing is built, not just slides.
Now same expertise in two countries - Finland and Thailand - private labs online - not a simulator - real CDRs, real correlation, real billing that works.
My surname - In straight translation it might mean "backyard Tero J" - but I am not. - I am Backyard Tero with private cores in Finland and Thailand, not just a backyard guy.
In every Finnish village there is a Backyard Tero - the guy with a bit of scrap in the backyard, a grill shelter and always a project ongoing. My last name is Takamaa - Backyard. The joke writes itself.
But my backyard has:
- Finland HPLMN - Private 5G SA Core - P-CSCF / S-CSCF / MRF / CHF - Rautalampi / Mehtiöjärvi
- Thailand VPLMN - Private 5G SA Core - Hua Hin, Thailand - same stack
- SEPP N32-f - real-time correlation < 1 sec, 2 ms best, 15 min max
- IMS Data Channel - Visual menu on phone without voice connection - MRF-CDR via SIP Call-ID
- OCDR / TCDR mediation - binary to billable - 0% leakage
Not just a backyard - Backyard Tero with private cores. Regular Backyard Tero level is trampoline. Takamaa level is operator. Two of them.
Nordic - European - Middle East - Americas - all done at Nokia.
I have worked at Nokia across Nordic, European, Middle East and Americas regions - with operators and vendors on critical mediation and charging cases, where a small billing gap risk was millions. That is where the learning came from - how real billing is built, not just slides.
Now same expertise in two countries - Finland and Thailand - private labs online - not a simulator - real CDRs, real correlation, real billing that works.
Private networks in two countries, Finland and Thailand, running real 5G IMS cores. Not a simulator. Real CDRs, real correlation, real invoices that open as PDFs.
The FIN 5G IMS Mediation Solution was built because roaming billing was too often "almost correct". In mediation, almost correct is not correct. Either the 2 binary CDRs become 1 ASCII that is billed correctly, also for prepaid, or it is not ready.
We keep it simple: 3GPP 5G-Advanced Rel 19 frozen Dec 2025, Rel 20 6G studies, Rel 21 first 6G specs 2028-2030. Built on standards, ready for what comes next.
The FIN 5G IMS Mediation Solution was built because roaming billing was too often "almost correct". In mediation, almost correct is not correct. Either the 2 binary CDRs become 1 ASCII that is billed correctly, also for prepaid, or it is not ready.
We keep it simple: 3GPP 5G-Advanced Rel 19 frozen Dec 2025, Rel 20 6G studies, Rel 21 first 6G specs 2028-2030. Built on standards, ready for what comes next.
What we do not reveal
We have worked with major Nordic, European, Middle East and Americas operators and vendors on critical mediation and charging cases where a small billing gap risked a large infrastructure decision. Details are under NDA.
No MOU names, no dollar figures, no vendor vs vendor stories here. What matters is the method: prove it with a live demo, not with a deck. If you want to see how OCDR and TCDR become a real invoice, open the demo. That is the credibility.
Humor allowed, secrets not. We can laugh about Finnish winter and Thai heat in the same core network, but we do not publish customer confidential details.
No MOU names, no dollar figures, no vendor vs vendor stories here. What matters is the method: prove it with a live demo, not with a deck. If you want to see how OCDR and TCDR become a real invoice, open the demo. That is the credibility.
Humor allowed, secrets not. We can laugh about Finnish winter and Thai heat in the same core network, but we do not publish customer confidential details.
Credibility in one live demo
Finland 5G IMS - HPLMN
Rautalampi / Mehtiöjärvi private core - online
VoNR, ViNR, SMSoIMS - 3GPP Rel 17+ - OCDR generation - CHF rating
Thailand 5G IMS - VPLMN
Hua Hin private core - online
Roaming simulation - S8HR and LBO tested - TCDR - visited charging
Mediation - vital
[FIN-IMS] OCDR received - MO VoNR - correlation via SIP Call-ID and P-Charging-Vector
[THA-IMS] TCDR received - MT VoNR roaming - SEPP N32-f secured
[MEDIATION] Correlation OK - OCDR + TCDR matched - duplicate 0%
[RATING] CHF rating - home + visited - TAP3 ready when needed, real-time when needed
[BILLING] Invoice generated - real PDF - postpaid and prepaid - HPLMN and VPLMN
[THA-IMS] TCDR received - MT VoNR roaming - SEPP N32-f secured
[MEDIATION] Correlation OK - OCDR + TCDR matched - duplicate 0%
[RATING] CHF rating - home + visited - TAP3 ready when needed, real-time when needed
[BILLING] Invoice generated - real PDF - postpaid and prepaid - HPLMN and VPLMN
Company - up to date
The FIN Telecom Oy - fintelco.fi - Finland - Thailand
Private 5G IMS Mediation Solution™ - built for 5G IMS, ready for 6G IMM
Focus: mediation, correlation, charging, real billing that works
No yellow, only shiny gold. Black background, gold details, vital.
Private 5G IMS Mediation Solution™ - built for 5G IMS, ready for 6G IMM
Focus: mediation, correlation, charging, real billing that works
No yellow, only shiny gold. Black background, gold details, vital.
The FIN Empire - Corporate Map
From Kokkola 1967 to Rautalampi / Mehtiöjärvi and beyond - private networks, mediation, gold backing - the whole empire mapped. Real roots, real infrastructure, no backyard Tero stories.
- OPEN TAKAMAA.COM - THE FIN EMPIRE 💎
Opens in new window - corporate map - takamaa.com
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BORN 1967 KOKKOLA - FINLAND - 5G-ADVANCED - 6G READY - VITAL
© 2026 THE FIN TELECOM OY - fintelco.fi - All rights reserved - Tero J Takamaa - Backyard Tero - real mediation - Tero J Takamaa
AI-assisted - FIN