Dependable telecom
for your business.
Topaz Inc. delivers global communications infrastructure for enterprises — international voice, SMS, RCS and fax through to global SIM/eSIM — as a one-stop service. Our own data centers and redundant interconnections keep mission-critical communication running.
Telecom Services
Voice, messaging and fax through to global SIM/eSIM — enterprise communications as a one-stop service. Open any service page for features, specifications and use cases.
International Voice
High-quality international voice via direct carrier interconnection, available wholesale to enterprises and carriers.
Learn more → SMS / WHOLESALE SMSInternational SMS
Direct delivery to 200+ countries and regions over 850+ operator connections — a high-deliverability platform.
Learn more → SMS PLATFORMSMSOne
A ready-to-use SMS platform — bulk sends to analytics, all from one console. No development needed.
Learn more → FAX / WHOLESALE FAX APIInternational Fax
Cloud fax that connects to core systems. Automate send/receive via API and go paperless.
Learn more → TOPAZ CLOUD SMS / FAXSMS & Fax API
REST APIs you can integrate in a few lines — adopted for mission-critical use, above all OTP verification.
Learn more → RCS / RICH MESSAGINGRCS API
Available in 40+ countries including Japan. Rich, two-way communication with images and video — on brand.
Learn more → AI VOICE / IVRAI Voice (IVR)
Automated voice response for reservations and first-line inquiries, 24/365, with consistent quality.
Learn more → WHOLESALE GLOBAL SIM / eSIMWholesale Global SIM / eSIM
Competitively priced wholesale IMSI and roaming data — IMSI profiles covering 200 countries and 650 operators.
Learn more →Why clients choose Topaz
Communication must never stop. We manage everything from infrastructure to operations ourselves, supporting your business with solid, dependable quality.
Our own infrastructure
Operated on our own data centers in Tokyo, Osaka, Kyoto, Nuremberg and Helsinki — minimal external dependency, quality assured in-house.
Redundancy and monitoring
850+ operator interconnections with redundant routing fail over automatically. Quality metrics monitored 24/365.
Security
Encrypted communication, access control and audit logs — designed security-first as a platform that carries OTP and other sensitive traffic.
Support at every step
From requirements and sandbox testing to API integration and post-launch monitoring — a dedicated team stays with you.
Track Record
From TSE Prime–listed enterprises to growing businesses — trusted continuously for mission-critical verification and notifications.
Company Profile
Dependable telecom,
for your business.
Adoption, wholesale, API integration, quotes — we are happy to help.