Switch from costly, outdated phone lines to cloud-based SIP trunking that scales with your needs.
With Signalmash, you get carrier-grade call quality, faster onboarding, and white-glove support so your communications just work.
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SIP (Session Initiation Protocol) trunking connects your phone system to the Public Switched Telephone Network (PSTN) using your internet connection instead of physical lines.
With SIP trunking from Signalmash, you can:
Cut Costs: Replace expensive on-premises equipment with flexible, internet-based voice infrastructure.
Scale on Demand: Instantly add or remove phone lines—no hardware required.
Expand Globally: Call and connect from anywhere, with local presence in every U.S. market.
Deliver clear, affordable outbound calls across the U.S. with direct Tier-1 carrier connections and transparent pricing.
Establish a local presence and receive inbound calls anywhere in the U.S. with high-quality, reliable service.
View MoreOffer customers a professional, easy-to-remember toll-free number for inbound calls, engineered for reliability and competitive cost.
View MoreUnlike “big-box” CPaaS providers, Signalmash combines enterprise-grade reliability with a partnership-first approach:
AT&T, Verizon, T-Mobile, and Bandwidth for crystal-clear calls and fewer hops.
Scale automatically with your business needs, pay only for what you use.
Simple, predictable rates with no hidden fees.
Real-time help from experts through your own Slack channel.
Everything a buyer needs on one screen: what a Signalmash trunk costs per minute, how SIP compares with the PRI it replaces and the hosted phone system it competes with, how to size a trunk, and what you need in place to go live.
Per-minute billing, no channel packs, and no charge for capacity up to 10 calls per second. The three plans differ only by monthly commitment; the rates below are the published US list prices from the pricing page.
| Per minute | Launch (no minimum) | Growth ($100/mo) | Scale ($1,000/mo) |
|---|---|---|---|
| Outbound, US Zone 1 | $0.0068 | $0.0065 | $0.0061 |
| Outbound, toll-free | $0.0018 | $0.0015 | $0.0011 |
| Inbound, local number | $0.0053 | $0.0050 | $0.0046 |
| Inbound, toll-free number | $0.0165 | $0.0140 | $0.0120 |
| Capacity (calls per second) | Up to 10 CPS free | Up to 10 CPS free | Up to 10 CPS free |
Higher-cost destinations sit in Zones 2 to 5 and are listed on the pricing page. Extra capacity is $375 a month for 10 to 25 CPS and $495 a month for 10 to 50 CPS, then $495 per additional 50 CPS. Local and toll-free numbers rent from $0.95 a month on Launch down to $0.50 on Scale. STIR/SHAKEN attestation, failover routing and branded caller ID are included; there is no setup fee. Worked examples for a 20-seat office, a 200-seat contact centre and a dialer are in the SIP trunking pricing guide.
| SIP trunking | PRI (T1) | Hosted VoIP / UCaaS | |
|---|---|---|---|
| What you keep | Your own PBX or contact-centre platform | Your own PBX | Nothing on site; the provider runs the phone system |
| Capacity | Elastic, in units of one call | Fixed 23 calls per circuit | Per seat |
| Pricing model | Per minute (or per channel), no circuit rental | Several hundred dollars per circuit per month plus long distance | $20 to $40 per user per month, minutes often bundled |
| Provisioning | Hours | Weeks | Days |
| Resilience | Fails over to a second connection, site or mobile number | One physical circuit, one failure point | Provider-managed |
| Best for | Businesses with a PBX or contact centre they like, BYOC to a CCaaS platform, call volumes where per-seat pricing stops making sense | Legacy installs; being withdrawn market by market | Small teams that want phones without owning a phone system |
Most searches for "SIP trunking Comcast" or "Spectrum SIP trunking" are businesses that already buy internet from a cable or incumbent carrier and are offered a trunk on the same bill. Those trunks are sold per concurrent call path on one- to three-year terms, usually with a block of included minutes, quote-based pricing that varies by region, and provisioning tied to the circuit. A carrier-neutral trunk is priced per minute with no term, runs over any internet connection, and scales by the call rather than by the channel. Neither model is wrong; they suit different call patterns.
A quick way to compare offers: divide the monthly channel fee by the minutes you actually use per channel. A $30 channel that carries 1,000 minutes a month costs $0.03 a minute, roughly five times the usage-based rate; a channel that carries 6,000 minutes costs $0.005 and is competitive. If you are mid-contract with a cable provider, Signalmash can run alongside it for outbound overflow or disaster routing and take the numbers when the term ends.
Size to peak concurrent calls, not to seats. A 50-person office rarely has more than 10 to 15 calls in progress at once; a 50-agent contact centre can have 50 plus queued inbound. Each G.711 call needs roughly 87 to 100 kbps in each direction including packet overhead, so 20 concurrent calls is about 2 Mbps symmetric, which any business connection handles as long as voice traffic is prioritised (QoS) over downloads and video. G.729 cuts that to about a third at some cost to audio quality. Because Signalmash trunks are elastic, you do not buy channels in advance; the 10 CPS included on every plan covers call set-up bursts for all but the largest dialers.
Deeper reading: what SIP trunking is, the best providers in 2026, wholesale SIP for resellers, Twilio Elastic SIP alternatives and the telecom glossary for any term above.
A trunk group is a collection of SIP trunks that manage call traffic. With Signalmash, you can organize and optimize trunk groups for better reliability and cost control.
Caller ID reputation matters. Signalmash helps you register and authenticate calls with STIR/SHAKEN and branded caller ID to ensure your business calls get answered.
We provide automatic failover and call forwarding to keep your business reachable at all times.
Elastic SIP trunking connects your PBX or contact center to the phone network over the internet with capacity that scales up and down automatically, so you pay per minute instead of for fixed channels. Signalmash routes calls over direct Tier-1 carrier connections for call quality.
Signalmash SIP trunking is billed per minute with no per-channel fees or setup charges, and inbound and outbound rates are published on the pricing page. Most businesses reduce voice costs by 30-50% compared with legacy PRI circuits or per-seat UCaaS bundles.
Yes. All outbound calls are signed with full STIR/SHAKEN attestation, and every number can be provisioned with E911 address registration. CNAM, number porting, call recording and real-time CDRs are available from the same portal or API.
Any SIP-compliant system works, including Asterisk, FreePBX, FreeSWITCH, 3CX, Cisco CUCM, Microsoft Teams Direct Routing via an SBC, and cloud contact center platforms. Signalmash provides configuration guides and engineer-led onboarding for each.
Guides from the Signalmash voice team for evaluating, pricing and migrating SIP trunks.
Whether you’re replacing legacy phone lines or scaling a contact center, we’ll guide you every step of the way.
