Why Businesses Switch from SIP.US
SIP.US keeps things simple with flat-rate per-channel pricing. But simplicity has limits — and when your business needs more PBX support, enterprise features, or cost optimization, IPComms delivers.
Per-Channel Fees Add Up
SIP.US charges $24.95/mo per unlimited channel. If you need 5 channels, that's $124.75/mo before any DID costs. IPComms charges $0 per channel — you only pay for the minutes you use, which is often much less for businesses with variable call volumes.
Limited PBX Integration Support
SIP.US works with standard SIP devices but offers limited documented support for specific PBX platforms. IPComms provides detailed setup guides and hands-on support for 12+ PBX systems including Asterisk, FreePBX, 3CX, Microsoft Teams, and more.
Missing Enterprise Features
SIP.US focuses on simplicity. IPComms adds enterprise-grade features: geo-redundant infrastructure, 99.99% uptime SLA, STIR/SHAKEN caller ID, TLS 1.3 encryption, and Microsoft Teams Direct Routing — all at competitive per-minute rates.
IPComms vs SIP.US: Feature-by-Feature
A detailed comparison of SIP trunking capabilities, pricing, and service for 2026.
| Feature | IPComms | SIP.US |
|---|---|---|
| Pricing Model | Pay-per-minute | $24.95/channel (unlimited) |
| Inbound Rate (US) | $0.009/min | Included in channel fee |
| Outbound Rate (US) | $0.010/min | Included in channel fee |
| Local DID Numbers | $1.50/mo | $1.00/mo |
| Toll-Free Numbers | $2.00/mo | $2.00/mo |
| Channel/Trunk Fees | $0 per channel | $24.95/channel |
| Contracts Required | No contracts | No contracts |
| Phone Support | All customers | Email/portal based |
| PBX Compatibility | 12+ documented PBXs | Standard SIP devices |
| Microsoft Teams | Direct Routing | Not supported |
| Encryption | TLS 1.3 + SRTP | TLS + SRTP |
| STIR/SHAKEN | Included | Included |
| E911 | $1.50/number | $1.50/number |
| Uptime SLA | 99.99% | 99.99% |
| Number Porting | Volume discount (100+ numbers) | Free |
| Established | 2002 (24 years) | 2005 (21 years) |
Cost Comparison: Real Numbers
Here's what a typical business actually pays per month with each provider.
IPComms
Lower CostExample: 10 DIDs, 3 channels needed, 5,000 outbound min, 3,000 inbound min
SIP.US
Same usage: 10 DIDs, 3 channels, 8,000 total minutes
Pricing based on publicly available rates as of March 2026. SIP.US is cheaper at this usage level if you fully utilize all 3 channels. However, IPComms includes real phone support, 12+ documented PBX integrations, Microsoft Teams Direct Routing, and geo-redundant infrastructure — enterprise features that SIP.US doesn't offer. For businesses using fewer minutes, IPComms' pay-per-minute model saves significantly more.
Which Provider is Right for You?
Choose IPComms if you:
- Have variable call volumes and want to pay only for what you use
- Need help configuring complex PBX systems (Asterisk, 3CX, Teams, etc.)
- Want real phone support from engineers who understand VoIP
- Need Microsoft Teams Direct Routing
- Require geo-redundant infrastructure and a formal uptime SLA
SIP.US may be better if you:
- Need predictable, unlimited calling on a fixed number of channels
- Prefer the simplicity of a single flat monthly rate
- Make thousands of minutes per channel per month
- Don't need hands-on PBX configuration support
- Only need basic SIP trunking without Teams or advanced integrations
Switching from SIP.US Takes Minutes
No downtime, no disruption. Keep your numbers, change your provider.
Sign Up & Configure
Create your IPComms account and configure your PBX with our SIP credentials. Takes under 10 minutes.
Test Your Connection
Make test calls to verify audio quality. Run both providers side-by-side during transition.
Port Your Numbers
Submit a porting request and we'll transfer your numbers from SIP.US with zero downtime.
Frequently Asked Questions
Common questions about switching from SIP.US to IPComms.
Is IPComms cheaper than SIP.US for SIP trunking?
It depends on your usage. SIP.US charges a flat $24.95/month per unlimited channel. IPComms charges $0 per channel with pay-per-minute pricing at $0.009/min inbound and $0.010/min outbound. For businesses using less than 2,500 minutes per channel per month, IPComms is significantly cheaper. For very high-volume users who need unlimited calling on a single channel, SIP.US's flat rate may be more economical — but IPComms offers more PBX integrations and enterprise features.
Can I switch from SIP.US to IPComms without downtime?
Yes. You can port your existing phone numbers from SIP.US to IPComms with zero downtime. The porting process typically takes 3–10 business days depending on the releasing carrier and 5-7 days for toll-free numbers. During the transition, you can set up IPComms SIP trunks alongside SIP.US and switch over when ready.
Does IPComms support more PBX systems than SIP.US?
Yes. IPComms works with any standard SIP device or PBX: Asterisk, FreePBX, 3CX, FreeSwitch, FusionPBX, Issabel, Kamailio, Yeastar, Cisco CUBE, Avaya, Genesys, and Microsoft Teams via Direct Routing. SIP.US supports standard SIP devices but has fewer documented PBX integrations and less hands-on configuration support for complex setups.
Does IPComms offer unlimited channels like SIP.US?
IPComms uses a different pricing model. Instead of charging per channel, IPComms offers $0 per channel with pay-per-minute billing. You can use as many concurrent channels as you need without paying per-channel fees. This model is more cost-effective for most businesses, especially those with variable call volumes.
What enterprise features does IPComms offer that SIP.US doesn't?
IPComms offers several enterprise-grade features: geo-redundant infrastructure across multiple data centers, a 99.99% uptime SLA, STIR/SHAKEN caller ID attestation, TLS 1.3 encryption, Microsoft Teams Direct Routing, and real phone support with PBX configuration assistance. SIP.US is a straightforward SIP trunk provider with a simpler feature set.
How does IPComms support compare to SIP.US support?
IPComms provides real human support via phone, email, and ticket for all customers. Their team has 24 years of PBX expertise and can help with configuration, troubleshooting, and migration. SIP.US offers support via email and their portal, but with less hands-on PBX configuration assistance.