SIP.US
VoIP providers
- Features
- Ease of use
- Ease of management
- Quality of support
- Affordability
- Market presence
Take the quiz to check if SIP.US and its alternatives fit your requirements.
$1.00 per number per month
Free Trial
Free version unavailable
Small
Medium
Large
-
What is SIP.US
SIP.US is a hosted SIP trunking and VoIP service that provides inbound and outbound calling over SIP for businesses and developers. It is typically used to connect IP-PBX systems, call center platforms, and SIP-capable applications to the public telephone network. The service focuses on SIP trunking fundamentals such as DID provisioning, call routing, and usage-based billing rather than bundled UC features. It is commonly adopted where teams want to bring their own PBX/contact-center software and control telephony configuration at the SIP level.
SIP trunking focused offering
SIP.US centers on SIP trunks, DIDs, and call routing rather than packaging a full unified communications suite. This fits organizations that already run an IP-PBX or a separate contact-center platform and only need PSTN connectivity. It can reduce overlap compared with more all-in-one business phone systems that include extensive agent, CRM, and collaboration layers.
Bring-your-own PBX compatibility
Because it uses standard SIP, SIP.US can be used with many SIP-capable PBXs, SBCs, and telephony applications. This supports custom call flows and integrations that are difficult to achieve in tightly coupled, proprietary calling stacks. It also helps teams keep their existing dial plan and telephony architecture while changing carriers.
Programmable telephony building blocks
SIP trunking services like SIP.US provide foundational components such as number provisioning and SIP-based call delivery that developers and telecom admins can incorporate into broader systems. This is useful for embedding voice into existing workflows or connecting multiple sites and systems through a consistent SIP interface. It is a practical fit for technical teams that prefer carrier-style primitives over end-user phone app features.
Limited end-user UC features
SIP.US is not positioned as a full business phone system with native team messaging, meetings, and end-user softphone experiences. Organizations that want a single vendor for calling plus collaboration and contact-center tooling may need additional products. This can increase implementation effort compared with more bundled platforms in the same space.
Requires telephony expertise
Deploying SIP trunks typically involves PBX/SBC configuration, codec and NAT considerations, and careful dial-plan and failover design. Teams without in-house voice engineering may face a steeper setup and troubleshooting curve than with turnkey cloud phone systems. Ongoing changes (routing, capacity, redundancy) also tend to be more technical.
Integration scope depends on ecosystem
While SIP interoperability is broad, deeper integrations (e.g., CRM click-to-call, agent assist, analytics, or workflow automation) generally come from the PBX/contact-center layer rather than the trunk provider. As a result, feature depth for reporting and agent productivity varies based on the connected platform. Buyers may need to validate compatibility and responsibilities across multiple vendors during implementation.
Plan & Pricing
SIP Channels
| Plan | Price | Key features & notes |
|---|---|---|
| Month-to-month SIP channel | $24.95 per channel/month | Unlimited outbound to US48 & Canada and unlimited inbound to local numbers; no setup fee; add/remove channels anytime (no contract). |
| Yearly SIP channel (annual billing) | $19.99 per channel/month (billed yearly) | Same features as month-to-month; volume pricing: contact sales. |
Inbound DID Telephone Numbers
| DID Type | Monthly price | One-time set-up fee / notes |
|---|---|---|
| US48 Local DID (Direct Inward Dial) | $1.00 per number/month | $1.00 one-time setup fee per number |
| Toll-free DID | $2.95 per number/month + $0.02/minute | $3.00 one-time setup fee per number |
| Nomadic e911 Enhanced DID | $2.50 per number/month | $2.00 one-time setup fee per number |
| Port fee (porting existing numbers) | $0.00 per month | $10.00 one-time port fee per number (volume discounts available for >10 numbers) |
Business Texting (package tiers)
| Package size | Price | Overage rate |
|---|---|---|
| 200 messages | $9.95 per month | $0.07 / message |
| 500 messages | $19.95 per month | $0.04 / message |
| 1,000 messages | $29.95 per month | $0.02 / message |
| 3,000 messages | $79.95 per month | $0.012 / message |
Notes: Includes 10DLC and toll-free messaging (brand/campaign registration costs may be additional). Message quantity is shared across numbers in account.
Fax Services
| Service | Price | Notes |
|---|---|---|
| SimpleFAX™ Service | $24.95 per FAX line/month | $25.00 one-time fee to port existing FAX DID; 1,000 pages/month included, $0.10 per additional page; hardware available for purchase. |
| Fax-to-email | $14.95 per number/month | $25.00 one-time fee to port existing FAX DID; 500 pages/month included, $0.10 per additional page. |
Metered / Pay-as-you-go
Pricing model: Pay-as-you-go (metered rates available) Details: SIP.US advertises a pay-as-you-go (metered) option but links to a partner for metered rate details; specific per-minute metered rates are not listed on the SIP.US pricing page.
Additional notes
- No monthly fee or setup fee for the SIP trunk itself; pricing is per SIP channel and per feature (DIDs, fax, SMS).
- Free trial: SIP.US provides a free SIP trunk trial (includes up to 60 minutes of outbound calling) with no credit card required.
- No evidence of a permanently free plan/tier (free account is a time-limited trial/test credit, not an ongoing free tier).
