SIP.US offers simple unlimited-channel pricing at $24.95/mo. IPComms offers $0 per channel with pay-per-minute billing — plus more PBX integrations, enterprise features, and real phone support that SIP.US doesn't provide.
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.
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.
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.
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.
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% | 99.999% |
| Number Porting | Free (100+ numbers) | Free |
| Established | 2002 (24 years) | 2005 (21 years) |
Here's what a typical business actually pays per month with each provider.
Example: 10 DIDs, 3 channels needed, 5,000 outbound min, 3,000 inbound min
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.
No downtime, no disruption. Keep your numbers, change your provider.
Create your IPComms account and configure your PBX with our SIP credentials. Takes under 10 minutes.
Make test calls to verify audio quality. Run both providers side-by-side during transition.
Submit a porting request and we'll transfer your numbers from SIP.US with zero downtime.
Common questions about switching from SIP.US to IPComms.
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.
Yes. You can port your existing phone numbers from SIP.US to IPComms with zero downtime. The porting process typically takes 7-10 business days for local numbers 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.
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.
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.
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.
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.
Get enterprise SIP trunking with $0 channel fees, more PBX integrations, and real phone support. Set up in under 10 minutes.