Wholesale Voice Infrastructure // Since 2006

Enterprise Wholesale VoIP Built for Scale, Backed by Real Voice Engineers

Powering service providers and enterprise communications with high-availability SIP infrastructure, programmable APIs, and direct engineer-level support—without the standard carrier friction.

Total network flexibility — from hybrid cloud hosting to Bring-Your-Own-Server (BYOS) — delivered on predictable month-to-month terms with zero long-term commitments.

Request SIP Interop Test Talk to a Voice Engineer

No credit card required • Zero minimum commitments • Direct Level-3 engineering setup

network_topology — live OPERATIONAL

ASR: 72.4% PDD: 310ms POPS: 6 GEO-REDUNDANT

Section 02 // Why C9 VoIP

Engineered Differently, On Purpose

Wholesale voice partnerships should be earned through engineering depth and network reliability—not locked in through contract friction.

Direct Level-3 Engineering Access

Skip the scripted front-line call centers.

Get immediate, direct access to senior voice engineers who read PCAPs, analyze SIP traces, and resolve routing issues on the spot.

Total Deployment Flexibility

Your infrastructure, exactly where it belongs.

From hybrid cloud hosting to Bring-Your-Own-Server (BYOS). Deploy your voice infrastructure exactly where it makes sense for your business.

Transparent Commercial Terms

Scale at your own pace, without predatory contracts.

Maintain total control with month-to-month flexibility and zero minimum commitments. No volume quotas, no hidden fees, no artificial thresholds.

Section 03 // Core Network

SIP Infrastructure & Core Network Services

Engineered for high-volume service providers and enterprise voice platforms, C9 VoIP delivers resilient, carrier-grade SIP connectivity designed for complete operational flexibility.

Dedicated SIP Trunking

High-concurrency, low-latency SIP trunks built for heavy inbound and outbound voice traffic.

> SPECS_ON_HOVER

[CODECS: G.711u/a, G.729, OPUS]

[DTMF: RFC 2833 / SIP INFO]

[TRANSPORT: UDP, TCP, TLS/SRTP]

[ASR: >70%] [PDD: <500ms]

View technical detail →

SIP & Media Proxy Services

Registration proxying and media relay for NAT traversal, topology hiding, and endpoint signaling.

> SPECS_ON_HOVER

[MODE: REGISTRATION PROXY]

[MEDIA: RELAY / NAT TRAVERSAL]

[SECURITY: TOPOLOGY HIDING]

[SIGNALING: MULTI-BOUNDARY]

View technical detail →

BYOS & Universal Gateways

Connect any SIP-compliant SBC, PBX, or softswitch—FreeSWITCH, Asterisk, Kamailio, Cisco—without lock-in.

> SPECS_ON_HOVER

[INTEROP: FREESWITCH/ASTERISK]

[INTEROP: KAMAILIO/CISCO]

[LOCK-IN: NONE]

[CONFIG: GUIDED TEMPLATES]

View technical detail →

Verified Interoperability Matrix

LAB_VERIFIED::Q3

Platform	SIP/TLS	SRTP	DTMF RFC 2833	Status
Asterisk				VERIFIED
FreeSWITCH				VERIFIED
Kamailio				VERIFIED
Cisco CUBE				VERIFIED
Ribbon SBC				VERIFIED
Sansay				VERIFIED

Ready to route high-volume traffic through high-availability trunks?

Intelligent route optimization across all active trunks, monitored 24/7.

Schedule Interop & Trace Evaluation

Section 03.5 // Human Infrastructure

Partner Support & Level-3 Engineering

In wholesale voice, uptime and rapid resolution are everything. Our support model is built on one premise: proactive engineering and immediate technical access yield flawless execution.

# live_trace — ingress sbc-01.c9voip.net

INVITE sip:+1XXXXXXXXXX@sip.c9voip.com SIP/2.0

SIP/2.0 100 Trying

SIP/2.0 183 Session Progress # pdd: 212ms

SIP/2.0 200 OK # media: SRTP locked

Direct Level-3 Engineer Access

Skip the scripted front-line call centers. Senior voice engineers who read PCAPs, analyze SIP traces, and resolve routing issues on the spot.

Rapid Response Commitments

When network performance or call delivery is on the line, every second counts. Support workflows optimized for immediate technical triage.

Proactive Network & Route Monitoring

Continuous tracking of trunk health, media proxy latency, and call completion metrics—issues addressed before they impact end-users.

Aligned Technical Interest

Your network stability is our primary operating metric. True root-cause fixes that eliminate operational noise for good.

Tired of Tier-1 support tickets sitting in a queue?

Test Our SLA Response Time

Section 04 // Environment Architecture

Flexible Cloud & PBX Deployment Options

Deploy your voice infrastructure where it makes the most sense—inside the dedicated Cloud 9 network core, or integrated with your own on-premise hardware.

Management Model Comparison

DECISION_MATRIX::DEPLOYMENT_MODELS

Capability	Managed PBX	Unmanaged / Co-located
OS Hardening		—
Automated Backups		—
Patch Management		—
24/7 L3 Engineer Monitoring		—
Full Root Access	—
Secure IPsec/VPN Tunnels

OS Hardening
Automated Backups
Patch Management
24/7 L3 Engineer Monitoring
Full Root Access —
Secure IPsec/VPN Tunnels

OS Hardening —
Automated Backups —
Patch Management —
24/7 L3 Engineer Monitoring —
Full Root Access
Secure IPsec/VPN Tunnels

OS Hardening
Automated Backups
Patch Management
24/7 L3 Engineer Monitoring
Full Root Access
Secure IPsec/VPN Tunnels

Managed PBX Deployments

C9 senior voice engineers handle provisioning, OS hardening, updates, network security, and ongoing maintenance.

[MANAGED: OS, PATCH, BACKUP]

[ACCESS: CONTROLLED]

[RELIABILITY: 99.99% SLA]

[MANAGED: OS, PATCH, BACKUP]

[ACCESS: CONTROLLED]

[RELIABILITY: 99.99% SLA]

Unmanaged & Co-Located

Full root access and administrative control for organizations with dedicated in-house engineering teams.

[ACCESS: FULL ROOT]

[INTERFERENCE: ZERO]

[LAYER: RAW COMPUTE/NET]

[ACCESS: FULL ROOT]

[INTERFERENCE: ZERO]

[LAYER: RAW COMPUTE/NET]

Hybrid & Private Cloud

Run voice engines inside the Cloud 9 core for ultra-low latency, or bridge on-premise via IPsec/VPN tunnels.

[CONNECTIVITY: IPSEC/VPN]

[LATENCY: ULTRA-LOW]

[TOPOLOGY: PRIVATE/HYBRID]

[CONNECTIVITY: IPSEC/VPN]

[LATENCY: ULTRA-LOW]

[TOPOLOGY: PRIVATE/HYBRID]

Need non-standard isolation or vertical compliance? Explore custom environment architecture →

Section 05 // Programmable Control

Platform Control: Developer API & Wholesale Portal

Complete visibility and administrative control—visually through the single-pane portal, or programmatically embedded into your own software stack.

Full-Featured Developer API

Automate trunk provisioning, DID ordering, phone number porting, and call management with robust REST APIs and real-time webhooks. Everything the portal does, the API does.

POST /v1/trunks — provision trunk
POST /v1/dids/order — real-time DID ordering
GET /v1/cdrs — live call detail records
HOOK /v1/webhooks — event push subscriptions

Explore API Documentation Request Developer Sandbox

order_did.sh

# Order a DID programmatically
curl -X POST https://api.c9voip.com/v1/dids/order \
  -H "Authorization: Bearer $C9_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "npa": "212",
    "quantity": 10,
    "trunk_group": "nyc-primary"
  }'

# Response — 200 OK
{ "status": "provisioned",
  "dids": ["+12125550142", …] }

curl -X POST https://api.c9voip.com/v1/dids/order \
  -H "Authorization: Bearer $C9_API_KEY" \
  -d '{"npa":"212","quantity":10}'

Wholesale Self-Service Portal

DID inventory, automated billing, rate decks, and real-time CDR analytics in one hub.

1,240

ACTIVE_DIDS

72.4%

CURRENT_ASR

ACTIVE_TRUNKS

event_stream — live STREAMING

[11:01:31] [EVENT] webhook.sent → call.completed

[11:01:34] [EVENT] cdr.push → billing_endpoint

[11:01:37] [200] POST /v1/dids/order confirmed

[11:01:40] [EVENT] trunk.provisioned → trunk_id: 8842

Section 06 // Communication Throughput

Wholesale Messaging & Digital Cloud Fax

Extend your platform beyond voice—compliant, high-throughput SMS/MMS and secure digital fax, built for API integration or turnkey web management.

event_stream — live STREAMING

[11:01:31] [SUCCESS] sms.sent → +1XXXXXXXXXX

[11:01:34] [10DLC] campaign.vetted → brand_0442

[11:01:37] [DELIVERED] mms.payload → 1.2MB received

[11:01:40] [T.38] fax.received → doc_id_9921

Throughput events rendered in real time — the same telemetry your portal exposes.

10DLC & A2P Messaging Compliance

Full support for 10DLC registered brand and campaign traffic—carrier registration, campaign vetting, and throughput optimization handled with you.

[PROTOCOL: A2P/P2P]

[REGISTRATION: TCR/10DLC]

[TYPE: LONG-CODE/TOLL-FREE/SHORT-CODE]

[PROTOCOL: A2P/P2P]

[REGISTRATION: TCR/10DLC]

[TYPE: LONG-CODE/TOLL-FREE/SHORT-CODE]

View service detail →

Secure Cloud Fax (eFax)

Reliable Email-to-Fax and Web-to-Fax workflows. Send, receive, and archive facsimile documents digitally—no physical lines, no hardware.

[PROTOCOL: T.38/FoIP]

[FORMAT: PDF/TIFF]

[INTEGRATION: API/SMTP]

[PROTOCOL: T.38/FoIP]

[FORMAT: PDF/TIFF]

[INTEGRATION: API/SMTP]

View service detail →

Section 07 // Human Expertise

Custom Voice Deployments & Engineering Services

When off-the-shelf voice solutions fail to meet specialized technical or vertical compliance requirements, our engineering team designs, builds, and deploys custom voice architectures alongside your staff.

Discovery

Requirement analysis, compliance mapping, and traffic profiling with senior engineers.

Architecture

Bespoke SIP header logic, media proxying strategy, and failover design.

Integration

Middleware and API bridging into your CRMs, databases, and billing engines.

Deployment

Turnkey buildout—from network architecture to live traffic testing.

Bespoke SIP & Route Engineering

Tailored logic for complex routing: header manipulation, dynamic failover, specialized media proxying.

[LOGIC: CUSTOM SIP HEADERS]

[FAILOVER: DYNAMIC]

[SCOPE: ENTERPRISE]

[LOGIC: CUSTOM SIP HEADERS]

[FAILOVER: DYNAMIC]

[SCOPE: ENTERPRISE]

Middleware & Application Integration

Connect voice infrastructure to proprietary CRMs, internal databases, billing engines, and workflows.

[INTEGRATION: API/WEBHOOK]

[TARGET: CRM/BILLING/DB]

[BRIDGE: CUSTOM]

[INTEGRATION: API/WEBHOOK]

[TARGET: CRM/BILLING/DB]

[BRIDGE: CUSTOM]

Vertical-Specific Solutions

Deployments tailored to strict regulatory, data security, and operational standards across industries.

[COMPLIANCE: VERTICAL-SPECIFIC]

[ARCHITECTURE: ISOLATED]

[AUDIT: SUPPORTED]

[COMPLIANCE: VERTICAL-SPECIFIC]

[ARCHITECTURE: ISOLATED]

[AUDIT: SUPPORTED]

Have a custom network architecture or specialized compliance requirement?

Turnkey infrastructure buildouts, end to end.

Consult with a Systems Architect

Section 08 // Commercial Terms

Transparent Commercial Terms & Pricing

Wholesale voice partnerships should be earned through performance and network reliability—not locked in through predatory contracts or artificial spending thresholds.

Month-to-Month Flexibility

Total control over your vendor relationships—no long-term lock-ins required.

Zero Minimum Commitments

Scale traffic at your own pace without volume quotas or minimum spend penalties.

Transparent Rate Structures

Simple, competitive wholesale pricing across voice, proxy, messaging, and hosting.

Predictable Operational Costs

Clean billing with real-time CDR visibility for complete financial predictability.

Scalable Wholesale Voice Without the Carrier Lock-in

Provision trunks, test 10DLC routes, or deploy custom PBX instances on transparent month-to-month terms.

Open a Wholesale Account Speak with an Architect