VoIP.ms SIP Trunking review
A flexible SIP trunking service for businesses that need routing, security, and PBX control.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
VoIP.ms SIP Trunking connects an existing PBX, IP phone system, SIP gateway, or other SIP-compatible system to VoIP.ms for inbound and outbound calling. It is aimed at businesses with established telephony infrastructure, as well as managed service providers, resellers, ISPs, and other service providers. The service also supports Microsoft Teams, making it relevant for organizations combining SIP infrastructure with Teams-based calling workflows.
Pricing uses a hybrid model. The Inbound SIP Trunk plan lists pricing per channel, while burstable Virtual PRI is available as an additional service. VoIP.ms also advertises usage-based per-minute calling, so the total arrangement depends on channel needs and call activity. A free plan is not offered, and the contact-sales model suits organizations that want to discuss requirements rather than select a fully self-serve package.
Control is the main strength. Administrators can configure call routing and failover, codecs, DTMF, NAT options, SIP credentials, and multiple points of presence. Call detail records and call logs support operational oversight, while SIP-TLS and SRTP encryption, IP address restrictions, and POP restrictions add security controls. API access is available through REST/JSON and SOAP. Choose VoIP.ms when an existing PBX environment needs configurable SIP connectivity and integration options. Organizations seeking a free plan or a simpler, fixed-cost calling service should consider a different type of provider.
VoIP.ms SIP Trunking pros and cons
- Where it wins
- Supports inbound and outbound calling with routing and failover
- Includes SIP-TLS, SRTP, IP, and POP restrictions
- Offers REST/JSON and SOAP APIs plus PBX and Teams integrations
- Where it doesn't
- Pricing requires contacting sales for a tailored arrangement
- There is no free plan
- Usage-based per-minute calling can make costs variable
VoIP.ms SIP Trunking fact sheet, pricing and score →
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