Voice & Wholesale Carrier Services
Tier-1 quality international voice termination, origination and carrier interconnection - priced for wholesale, engineered for enterprise.
600+
Direct carrier interconnects
3B+
Minutes carried annually
99.99%
Switching availability
Voice & Wholesale, delivered as one portfolio.
Voice is where Dollu started and it is still the backbone of our business. We operate a geo-redundant softswitch core with SIP and TDM interconnects into Tier-1 carriers, mobile network operators and national incumbents, and we sell that capacity to enterprises, contact centres, OTT platforms and other carriers on transparent, per-destination pricing.
Every route in our portfolio is classified by quality tier - CLI-guaranteed premium, standard and wholesale - and continuously measured for ASR, ACD, PDD and MOS. Our routing engine steers traffic in real time so you get the quality you paid for, not the cheapest hop that happens to be up.
Whether you need to terminate ten million minutes a month to South Asia, originate toll-free calls in forty countries, or replace ageing PRIs with elastic SIP trunks, the same team, the same portal and the same 24×7 NOC stand behind you.
Everything in Voice & Wholesale.
Each service has its own detailed page - overview, capabilities, onboarding, use cases, specifications and FAQs.
Wholesale Voice Termination
Direct-route international voice termination to 230+ destinations with CLI-guaranteed, standard and wholesale quality tiers, real-time QoS and 24×7 NOC.
International A–Z Voice Routing
Managed A–Z route portfolio for carriers and aggregators: LCR with ASR/ACD/PDD guardrails, per-prefix overrides, routing profiles, live testing and rate-deck automation.
Voice Origination & Inbound
Carrier-grade inbound origination: DIDs and toll-free in 110+ countries terminated to your SIP endpoints with geo-redundant delivery, elastic capacity and real-time CDRs.
SIP Trunking
Global SIP trunking with elastic channels, TLS/SRTP, E911 and emergency calling where mandated, and tested integration with leading PBX, UCaaS and CCaaS platforms.
Carrier Interconnection
Direct carrier-to-carrier interconnection: SIP and TDM handoff, PoP cross-connects, private IP interconnect and bilateral or swap agreements for licensed operators.
International Long Distance (ILD)
ILD calling for enterprises and service providers: country bundles, per-minute plans, callback and PIN access, and a white-label platform for MVNOs, ISPs and OTT brands.
Voice Quality Management
Managed voice quality: passive KPI monitoring on every call, active route and CLI testing in 60+ countries, SLA dashboards, alerting and 24×7 NOC root-cause support.
Voice Fraud Protection
Voice fraud management for carriers and enterprises: real-time call analytics, IRSF and Wangiri detection, velocity and spend controls, destination blocking.
Enterprise & Business Voice
Managed global voice for enterprises: SIP trunking, numbers in 110+ countries and PSTN breakout on one platform, integrated with your PBX, Teams or contact centre.
Caller ID Authentication, STIR/SHAKEN & Branded Calling
STIR/SHAKEN attestation, CNAM, number reputation monitoring and remediation, branded caller display and KYC-backed international CLI so calls are answered, not flagged.
Emergency Calling & E911
E911 with dynamic location for the US and Canada, 112/999 routing internationally, nomadic-user support and an address API - Kari’s Law and RAY BAUM’s Act compliant.
What sets our voice & wholesale apart.
Direct routes, not resold hops
Bilateral interconnects with 600+ carriers and MNOs mean fewer intermediaries, better CLI delivery and margins we can pass on.
Quality you can measure
Live ASR/ACD/PDD dashboards, per-route MOS scoring and SLA-backed premium tiers on every destination.
Fraud & revenue assurance
Real-time traffic-pumping, IRSF and Wangiri detection with automatic blocking - protecting your margin and ours.
Carrier-grade operations
24×7 NOC, ticketed escalation, monthly QoS reviews and a dedicated carrier-relations manager for every account.
Built for the sectors that depend on communications.
- Banking & Financial Services
Carrier-grade OTP messaging, secure contact-centre voice and private connectivity for banks, insurers, NBFCs and fintechs - built for regulated traffic, audited networks and zero tolerance for downtime.
- Contact Centres & BPO
CLI-guaranteed outbound termination, inbound toll-free and DIDs in 100+ countries and a CCaaS stack that scales from 20 seats to 20,000 - for operators who live by answer rates and cost per minute.
- Carriers, MNOs & MVNOs
Wholesale voice and SMS, bilateral interconnection, roaming and signalling, A2P monetisation and number hosting - from a carrier that operates 600+ direct interconnects and 800+ SMS operator connections.
- Healthcare & Life Sciences
Appointment reminders that cut no-shows, telehealth voice and video APIs, number masking that protects patient privacy and connectivity built for clinical uptime - with GDPR- and HIPAA-aligned controls.
- E-commerce & Retail
Order OTPs and shipping notifications at peak-season scale, WhatsApp and RCS engagement, delivery number masking, omnichannel support and store connectivity - one carrier across the whole customer journey.
- Travel, Hospitality & Logistics
Booking and gate-change alerts in any country, local numbers for every property and hub, IoT SIMs and fleet tracking across borders, and a contact centre that follows the sun.
- Media, Broadcast & Gaming
Contribution and distribution circuits for broadcasters, CDN and live-event connectivity, a low-latency 1.4 Tbps backbone, DDoS protection for game servers and voice and chat APIs for in-game communities.
- SaaS, ISVs & Startups
Voice, SMS, verify and video APIs on a carrier's own network, numbers in 110+ countries, white-label reselling and usage-based pricing - from your first sandbox call to your first hundred million.
Voice & Wholesale - common questions.
The questions customers and carriers ask us most often before they interconnect. If yours is not here, our team answers within one business day.
Still have a question?
Ask our solutions teamOther service areas.
- Global Numbers & DIDs
Virtual numbers, DIDs, toll-free, mobile and cloud calling numbers across 110+ countries with regulatory-compliant KYC, porting and inbound routing.
- Messaging & A2P SMS
Enterprise and wholesale A2P SMS, international SMS termination, OTP/verification, RCS and WhatsApp Business messaging over direct MNO connections with SMS-firewall protection.
- Communication APIs (CPaaS)
Voice API, SMS API, Verify (OTP) API, Video/WebRTC API and Email API with SDKs, webhooks and carrier-grade delivery - build communications into any application.
- Unified Communications & Contact Centre
Cloud PBX, UCaaS, omnichannel CCaaS, Microsoft Teams Direct Routing/Operator Connect, IVR and conversational AI - delivered on Dollu's carrier network with global numbering.
- Network & Connectivity
Enterprise WAN and internet: MPLS/IP-VPN, dedicated internet access, SD-WAN, Ethernet private lines, managed WAN/LAN/Wi-Fi, cloud and data-centre connectivity, and private 5G.
- Cloud & Hosting
Cloud infrastructure, private and hybrid cloud, managed hosting, cloud migration, backup and disaster recovery, and edge/GPU compute - with private connectivity built in.
- Cyber Security
Network-integrated security: DDoS mitigation, managed next-gen firewall, SASE and Zero Trust access, managed detection and response, and security assessments.
- Mobile, Roaming & IoT
IoT connectivity with eSIM and multi-carrier SIMs, international roaming and steering, SS7/Diameter signalling services, and fleet & asset tracking solutions.
- Media & Content Delivery
Global video transmission for contribution and distribution, live-event and remote-production connectivity, and content delivery network services for OTT and gaming.
Talk to our voice & wholesale team.
Share your requirements - destinations, countries, sites, volumes - and we will come back with a design and commercial proposal within one business day.
