LIVE · CHANNELS UP49,500

VICIDIAL-NATIVE · OPERATOR-OWNED · CARRIER-GRADE

The carrier VICIdial operators trust.

Q: What is a VICIdial carrier?

A VICIdial carrier is a SIP trunk provider whose platform is specifically tuned for VICIdial's predictive dialing behavior: high concurrent channels, fast call setup, flexible CID handling, and A-level STIR/SHAKEN attestation. SIPNEX is operator-owned — we run VICIdial on our own network and sell the carrier service to other operators.

Q: Why does my dialer need a specific carrier?

Generic carriers throttle high-velocity outbound traffic, apply B-level attestation, and have support teams that don't understand predictive dialing. VICIdial operators need unlimited channels, direct A-level signing, CID rotation flexibility, and engineers who speak sip.conf.

Q: Can SIPNEX handle 1,000+ concurrent calls on one VICIdial instance?

Yes. Our carrier infrastructure is built for high-concurrency outbound. Channel capacity is not capped at the trunk level — you scale as your instance scales.

Q: How do you prevent CID burn on high-velocity campaigns?

Two things matter: (1) direct A-level STIR/SHAKEN attestation from the originating carrier, which we sign ourselves with our own SP-KI certificate, and (2) intelligent CID pool management integrated with VICIdial's dialer logic. We help operators configure both.

Q: Do you provide STIR/SHAKEN A-level attestation for VICIdial outbound?

Yes. SIPNEX holds its own STIR/SHAKEN Service Provider certificate, meaning every outbound call signed at our network is attested at the A level — not reshipped through a downstream carrier that can only provide B or C level.

Q: How fast can I be dialing with a new SIPNEX trunk?

24 hours is typical from signed agreement to live trunk. Complex porting scenarios take longer but we provision your initial DIDs and trunk credentials within one business day.

Q: What's the difference between SIPNEX and Bandwidth or Telnyx for VICIdial?

Bandwidth and Telnyx are excellent CPaaS carriers but are built generic-first — their support teams and tooling aren't VICIdial-specialized. SIPNEX is operator-owned and VICIdial-native, meaning every decision we make (CID tooling, channel limits, support response, pricing structure) is optimized for dialer operators.

Q: Are you TCPA compliant?

SIPNEX provides the carrier infrastructure and compliance tooling (attestation, call recording controls, opt-out signaling) that supports TCPA-compliant outbound. The legal TCPA obligations — consent capture, DNC scrubbing, time-of-day rules — remain with the caller. We give you the tools; we don't take the responsibility off your plate.

FCC-licensed. 499-registered. STIR/SHAKEN signed with our own SP certificate. Every call we originate gets A-level attestation—no resellers, no rewrapped trunks, no downstream dilution.

Request Dialer-Grade Trunk → See pricing

OR CALL AN OPERATOR · (833) 665-2220

A -level

STIR/SHAKEN attestation, signed by us

<24 hr

From signed agreement to live trunk

99.99%

Median monthly carrier uptime

1,247+

Operators dialing on SIPNEX today

FCC LICENSED CARRIER OWN STIR/SHAKEN SP CERTIFICATE 499 FILER ID A-LEVEL ATTESTATION ROBOCALL MITIGATION REGISTERED OPERATOR-OWNED DIALER-GRADE TCPA COMPLIANT TOOLING UNLIMITED CONCURRENT CHANNELS 24-HOUR PROVISIONING FCC LICENSED CARRIER OWN STIR/SHAKEN SP CERTIFICATE 499 FILER ID A-LEVEL ATTESTATION ROBOCALL MITIGATION REGISTERED OPERATOR-OWNED DIALER-GRADE TCPA COMPLIANT TOOLING UNLIMITED CONCURRENT CHANNELS 24-HOUR PROVISIONING

The dialer operator's Monday

Your generic carrier doesn't know what you do.

They sold you a trunk designed for an office phone. You're running a call center. The misfit shows up every day—in call drops, flagged CIDs, B-level attestation, and a support queue that doesn't understand what "VICIdial" means.

Your CIDs keep getting flagged

Without direct A-level attestation, your numbers degrade fast. Most resellers can only hand you B-level.

Your answer rate collapsed overnight

Carriers change STIR policy and don't tell you. You find out when your dashboard drops 30%.

Your carrier doesn't speak VICIdial

Support tickets that start with 'what's sip.conf' are a sign you're not with the right partner.

GENERIC-CARRIER · CID POOL · LIVE

● 14● 6● 4

(336) 520-7452

CLEAN

(524) 709-6195

CLEAN

(334) 554-6128

CLEAN

(898) 600-9446

CLEAN

(829) 712-6007

CLEAN

(535) 437-3347

CLEAN

(804) 846-2846

CLEAN

(469) 292-8098

CLEAN

(580) 595-7262

CLEAN

(437) 603-2731

CLEAN

(442) 649-4520

CLEAN

(438) 857-4044

CLEAN

(754) 525-6234

CLEAN

(344) 631-5155

CLEAN

(397) 545-4397

FLAGGED

(759) 700-2369

FLAGGED

(373) 887-2664

FLAGGED

(658) 874-6273

FLAGGED

(525) 569-6574

FLAGGED

(483) 440-5817

FLAGGED

(682) 849-9659

BURNED

(556) 635-1874

BURNED

(600) 891-2230

BURNED

(494) 321-6526

BURNED

B-LEVEL ATTESTATION · downstream↓ ANSWER RATE −38% (24h)

The call path

We sign your calls. Not somebody three hops away.

STIR/SHAKEN attestation is only A-level when the originating carrier signs it. SIPNEX holds its own SP-KI certificate. We sign at our edge—not via a reseller, not via a downstream wholesaler. The cert chain stops at us.

● THE SIPNEX PATH

Your call signed once, directly, A-level.

ORIGIN

Your VICIdial

OUTBOUND

A-LEVEL · SIGNED HERE

SIPNEX

CARRIER

SIPNEX SP cert

SIGNING

TERMINATION

PSTN

A-LEVEL

DOWNSTREAM CARRIER RECEIVES

ATTEST = A

Full trust · CID stays clean

○ THE GENERIC CARRIER PATH

Re-wrapped, re-signed, downgraded.

ORIGIN

Your VICIdial

OUTBOUND

UNSIGNED

RESELLER

CPaaS layer

PASS-THROUGH

CARRIER

Upstream

SIGNING

TERMINATION

PSTN

B-LEVEL

DOWNSTREAM CARRIER RECEIVES

ATTEST = B

Partial trust · CID degrades

Receipts

Inside the SIP INVITE we put on the wire.

The Identity header carries the STIR/SHAKEN PASSporT. It points at cert.sipnex.net, our public SP cert. Every downstream switch on the route verifies the signature against it—and sees attest=A.

You don't need to understand the math. You just need to know: every minute you dial through SIPNEX is signed at our edge. Not relayed. Not re-wrapped.

# Outgoing SIP INVITE — what your customer's carrier sees
INVITE sip:+15555550100@pstn.gw SIP/2.0
From: "Acme Calls" <sip:+18006612344@sipnex.net>
To:   <sip:+15555550100@pstn.gw>
Call-ID: 9f8a1c2d-2026-05@vd-1.acme.io
Identity: eyJhbGciOiJFUzI1NiIsInBwdCI6...
  info=<https://cert.sipnex.net/sp.pem>
  ;ppt=shaken
  ;alg=ES256
  ;attest="A"  # signed by SIPNEX
Content-Type: application/sdp

# downstream carriers see attest=A and trust accordingly

Capability comparison

SIPNEX vs your current carrier.

The capabilities that decide whether your dialer hits 35% answer rate or 18% answer rate. Run the comparison.

CAPABILITY

SIPNEX

GENERIC

Own FCC carrier license

Often reseller

Own STIR/SHAKEN SP certificate

Shared / inherited

Direct A-level attestation

B-level typical

Unlimited concurrent channels

Capped 10–50

VICIdial-fluent support

Generic tier-1

24-hour trunk provisioning

5–10 business days

Operator-run, not sales-run

Sales-run

Transparent per-minute pricing

Quote-gated

CONCURRENT CHANNELS · BUSINESS-HOURS PEAK

SIPNEX 52,400

Mon–Fri 8a–6p CT · unlimited at the trunk

GENERIC CARRIER 50

Capped at 10–50 per trunk · upgrade gates

PROVISIONING TIME · TYPICAL

<24hr

SIPNEX · SIGNED → DIALING

5–10 days

GENERIC · TICKET QUEUE

Network footprint

Built for North American outbound.

Routes anchored on our own gear in Lubbock with diverse interconnects into Tier-1 PSTN gateways. US primary. Canada secondary. Every packet stays on-network until it has to leave.

PoP locations

14ms

Median latency

99.99%

Carrier uptime

Tier-1

PSTN interconnects

From the desk

Operator-grade knowledge base.

ALL ARTICLES →

● DID

Number Porting: Move Numbers to a New Carrier

Apr 16, 2026 →

● VOIP

How VoIP Works: The 5-Minute Technical Explainer

Apr 15, 2026 →

● VOIP

VoIP Glossary: 60 Terms Explained

Apr 13, 2026 →

● SIP-TRUNKING

What Is Elastic SIP Trunking?

Apr 11, 2026 →

● SIP-TRUNKING

SIP Trunk Setup: VICIdial, Asterisk & FreePBX

Apr 10, 2026 →

● PBX

What Is a PBX? Should You Run One in 2026?

Apr 9, 2026 →

Guides for Operators

What Is SIP Trunking? →A vs B Level Attestation →VICIdial SIP Trunk Setup →TCPA Compliance Checklist →Best SIP Trunk Providers 2026 →How VoIP Works →

Frequently asked

Operator-to-operator answers.

We dial on the same network we sell. If a question isn't here, call us—someone who's run a dialer picks up.

CALL AN OPERATOR

(833) 665-2220

What is a VICIdial carrier?

A VICIdial carrier is a SIP trunk provider whose platform is specifically tuned for VICIdial's predictive dialing behavior: high concurrent channels, fast call setup, flexible CID handling, and A-level STIR/SHAKEN attestation. SIPNEX is operator-owned — we run VICIdial on our own network and sell the carrier service to other operators.

Why does my dialer need a specific carrier?

Generic carriers throttle high-velocity outbound traffic, apply B-level attestation, and have support teams that don't understand predictive dialing. VICIdial operators need unlimited channels, direct A-level signing, CID rotation flexibility, and engineers who speak sip.conf.

Can SIPNEX handle 1,000+ concurrent calls on one VICIdial instance?

Yes. Our carrier infrastructure is built for high-concurrency outbound. Channel capacity is not capped at the trunk level — you scale as your instance scales.

How do you prevent CID burn on high-velocity campaigns?

Two things matter: (1) direct A-level STIR/SHAKEN attestation from the originating carrier, which we sign ourselves with our own SP-KI certificate, and (2) intelligent CID pool management integrated with VICIdial's dialer logic. We help operators configure both.

Do you provide STIR/SHAKEN A-level attestation for VICIdial outbound?

Yes. SIPNEX holds its own STIR/SHAKEN Service Provider certificate, meaning every outbound call signed at our network is attested at the A level — not reshipped through a downstream carrier that can only provide B or C level.

How fast can I be dialing with a new SIPNEX trunk?

24 hours is typical from signed agreement to live trunk. Complex porting scenarios take longer but we provision your initial DIDs and trunk credentials within one business day.

What's the difference between SIPNEX and Bandwidth or Telnyx for VICIdial?

Bandwidth and Telnyx are excellent CPaaS carriers but are built generic-first — their support teams and tooling aren't VICIdial-specialized. SIPNEX is operator-owned and VICIdial-native, meaning every decision we make (CID tooling, channel limits, support response, pricing structure) is optimized for dialer operators.

Are you TCPA compliant?

SIPNEX provides the carrier infrastructure and compliance tooling (attestation, call recording controls, opt-out signaling) that supports TCPA-compliant outbound. The legal TCPA obligations — consent capture, DNC scrubbing, time-of-day rules — remain with the caller. We give you the tools; we don't take the responsibility off your plate.

The next step

Talk to an operator. Not a rep.

Tell us how many instances you're running and how many minutes you dial a month. We'll tell you whether SIPNEX is the right fit—honestly.

~/sipnex/onboarding

Request Dialer-Grade Trunk → Book a 20-min Call

OR CALL DIRECT · (833) 665-2220 · MON–FRI · 9A–6P CT