Voice infrastructure for operators
Every call accounted for, before it connects.
OttoCall sits between your carrier and your traffic. It authorises each session, meters every second, and settles in real time — so capacity stays predictable and spend never runs ahead of you.
Running continuous German voice traffic since 2026
One control plane
Your carrier contracts stay yours. We apply authorisation, routing and metering to each call before the carrier ever sees it.
Pre-call authorisation
Balance, tariff, destination and access window are checked before the invite leaves. The ceiling is enforced up front, not reconciled at month end.
Second-accurate settlement
Talk time is rated the moment a call ends and reflected in the balance immediately. Ring time is never billed.
Managed transport
Low-latency SIP delivery engineered for sustained volume, with routing behaviour that does not drift under load.
Caller ID under policy
Each line is pinned to the country it may present. Foreign numbers are refused at our edge, not at the carrier's.
Three steps to live traffic
- 01
Apply for access
Register and complete a short verification with our team.
- 02
Receive your lines
SIP credentials and routes configured for your traffic profile.
- 03
Route and settle
Send traffic through OttoCall — metering and balance stay in step.
Bring your traffic under control.
Operators use OttoCall as the layer between carrier capacity and what it actually costs.
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