Singapore's business VoIP market splits into four practical groups: hosted PBX / cloud phone platforms (the all-in-one office phone systems), SIP trunking carriers (voice channels that plug into your own PBX or Microsoft Teams), cloud contact-centre / CCaaS vendors (sales and support call centres), and CPaaS providers (voice APIs you build into your own app). The right pick depends far less on "who has the most features" and more on which of those four jobs you actually need done.
This page groups VoIP and cloud-telephony providers with a verified Singapore presence — hosted-PBX and cloud phone platforms, SIP trunking carriers, cloud contact-centre (CCaaS) vendors, and CPaaS voice-API providers. We include locally based hosted-PBX and SIP integrators alongside the global cloud-phone platforms that serve Singapore numbers, so you can compare a Singapore SBO-backed provider against a self-service SaaS dial-tone in one place. The list is unranked: sorted by Verified Score, then company name. Inclusion reflects a verified Singapore presence, not endorsement.
Below the list, the buyer's guide covers IMDA numbering rules, the real difference between hosted PBX and SIP trunking, Microsoft Teams Direct Routing, PDPA obligations for call recording, and the questions that separate a genuine Singapore voice partner from an overseas reseller with no local support. If you're shortlisting more than one vendor, use the comparison tool to line them up side by side.
Notable voip providers
Grouped by role in the market. Within each group, ordered by Verified Score, then company name — not a ranking. Inclusion reflects a verified Singapore presence, not endorsement.
Listing order reflects verified signals and is not affected by payment. Sponsored placements, if any, are labelled separately and never reorder this list.
Hosted PBX & cloud phone platforms
Cloud-hosted phone systems that replace on-premises PBX hardware.
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CallTower is a US-based unified communications service provider offering hosted Microsoft Teams Voice, Cisco Webex Calling, Cisco UCM, Zoom Phone, Five9 contact center, and Operator Connect services to enterprise customers across North America, Europe, and Asia. The company...
Verified Score 23/100
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Crexendo is a US-based cloud communications provider offering hosted UCaaS, contact center, and SIP trunking services. The company also provides the Crexendo NetSapiens platform, which powers other UC service providers globally. Crexendo operates with a dual business model:...
Verified Score 23/100
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Dodid is a Singapore-based unified-communications and cloud PBX service originally launched as an SMB-focused VoIP provider, now operating under the Empyrion Digital group. The platform delivers hosted business phone numbers, IVR, call recording, mobile apps, video...
Verified Score 23/100
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SIP trunking & voice carriers
SIP trunk providers and licensed voice carriers for bring-your-own-PBX and Teams Direct Routing.
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LWS Network is a Singapore-licensed services-based telecommunications operator providing international voice termination, SIP trunking, and wholesale carrier services. The company operates within Singapore's IMDA-licensed services-based operator (SBO) framework, focusing on...
Verified Score 25/100
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Deltel Technologies Singapore is a Singapore-licensed services-based operator providing international voice termination, SIP trunking, and wholesale telecommunications services to carriers, BPOs, and enterprises. The company focuses on international long-distance voice,...
Verified Score 23/100
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Cloud contact-centre & CX
Contact-centre-as-a-service and customer-experience voice platforms.
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TechDirectory.sg could not verify a current public service description for advoco from the listed website or reliable search results as of July 10, 2026. The available material was unavailable, unrelated, inactive, or too thin to support a factual company overview. This...
Verified Score 23/100
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AVOXI provides enterprise cloud communications with international voice coverage in over 150 countries. Its platform offers toll-free, two-way local, and Local DID numbers, managed through a SaaS interface. AVOXI integrates with contact center, communications, and AI...
Verified Score 23/100
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Other notable providers
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Calilio is a cloud-based virtual phone system targeting small and mid-sized businesses, sales teams, and customer-support operations. The platform offers business phone numbers in 100+ countries, shared inboxes, IVR menus, call recording, voicemail transcription, SMS/MMS,...
Verified Score 23/100
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Grasshopper is a virtual phone system designed for entrepreneurs and small businesses seeking a professional business presence without dedicated hardware. It provides toll-free, local, and vanity phone numbers with features including call forwarding, voicemail transcription,...
Verified Score 23/100
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KrispCall is a cloud-based virtual phone system aimed at sales, support, and operations teams in SMBs and growing companies. The platform offers business numbers in 100+ countries (local, toll-free, mobile, national), unified call inbox, shared inbox, IVR, call recording,...
Verified Score 23/100
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How to choose a VoIP provider in Singapore
First decide which of the four jobs you have. A 20-person office that just wants desk phones and a main line needs a hosted PBX (3CX, Yeastar, 8x8, or a local provider's cloud-voice package). A company that already runs Microsoft 365 usually wants SIP trunking into Teams Direct Routing rather than a second phone app. A sales or support team needs a contact-centre platform (CCaaS) with call queues, recording, and CRM screen-pop. A product team that wants click-to-call inside its own software needs CPaaS voice APIs. Buying the wrong category is the most common and most expensive VoIP mistake.
Confirm the provider can give you local Singapore (+65) DID numbers and number porting. IMDA mandates number portability, so you can move existing +65 fixed-line numbers to a new VoIP provider — but not every overseas SaaS platform actually supports +65 DIDs or local porting. Ask explicitly: can they issue new +65 numbers, can they port your existing ones, and how long does porting take (typically 5-10 business days)?
Check emergency calling and local support. A pure overseas VoIP service may not route 995/999 emergency calls correctly from a Singapore location, and "24/7 support" in another time zone is not the same as a local team. For business-critical voice, favour a provider with Singapore-based support and a clear position on emergency-services routing.
Hosted PBX vs SIP trunking — pick deliberately. Hosted/cloud PBX is fastest to deploy and needs no on-prem hardware, but locks your dial plan to that vendor. SIP trunking keeps your PBX (or Teams) and lets you run multiple SIP carriers competing on price and resilience — more control, slightly more setup. On-prem PBX (Avaya, Cisco, Mitel, Asterisk) still suits contact centres with deep CRM integration or strict recording rules.
Plan for PDPA on call recording. If you record calls, the Personal Data Protection Act requires notification and a lawful basis, and if recordings or call metadata are stored or processed outside Singapore you need compliant cross-border transfer terms. Ask each vendor exactly where call recordings and CDRs are stored, who can access them, and how long they are retained.