Help centre
Frequently asked questions.
The questions carriers, enterprises and developers ask us most - grouped by topic. Every service page also has its own FAQ section.
Dollu Ltd is a global carrier and communications provider headquartered in Noida, India, with interconnect PoPs in Mumbai, Singapore, London, Frankfurt, Amsterdam and Ashburn. We provide wholesale and enterprise voice, numbers in 110+ countries, messaging, communication APIs, unified communications and contact-centre platforms, and enterprise connectivity, cloud and security.
SIP over public internet (with SRTP/TLS options), IPsec or MPLS private interconnect, or a physical cross-connect at any Dollu PoP. Send your signalling IPs and we provision the trunk within one business day; TDM/SS7 is supported via partner gateways where required.
110+ countries for numbers overall and 100+ for local (geographic) numbers, plus toll-free in 100+ markets. Availability by city and number type is confirmed at order time; the Coverage page has detailed guides for key markets.
SMPP 3.4 binds for high-throughput A2P and wholesale traffic, REST/HTTP API for applications, or the campaign portal for marketing teams. Sandbox credentials are available on request.
Voice (calls, IVR, recording, media streaming), SMS/Messaging (SMS, MMS, RCS, WhatsApp), Verify (OTP/2FA over SMS, voice, WhatsApp, flash call, email), Video/WebRTC, Email, Number Lookup and Fax - with SDKs for Node.js, Python, Java, Go, PHP and .NET.
Prepaid (online top-up with auto-recharge) or postpaid after credit review; invoices in USD, EUR, GBP or INR; usage visible in real time in the portal with CDR/API export for reconciliation.
Service FAQs
Detailed answers per portfolio.
Each service and portfolio page carries its own FAQ written by the team that runs it.
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