SIP Trunk Services & Number Porting – Charlotte, NC

AtoZinIT 3CX Platinum Partner

At AtoZinIT, we specialize in SIP trunk services and 3CX phone system hosting in Charlotte, NC, giving your business everything it needs to make and receive calls reliably - without inflating your costs.

The 3CX phone system is an advanced software PBX that manages call switching, routing, and unified communications. It depends on external SIP trunks - connections to the public phone network - to deliver and receive calls.

AtoZinIT 30 Years

Why Choose AtoZinIT for SIP Trunking?

Why Choose AtoZinIT
  • No Markup, No Lock-In – You pay provider rates directly, with no inflated margins. You own your account and can port away anytime—we'll even help.
  • Full 3CX Expertise – SIP trunking is part of our end-to-end 3CX hosting and support stack, including 3CX Phone Systems, 3CX Hosting, and 3CX Support & Management
  • Flexible Provider Options – Use our vetted partners like Twilio or Telnyx, or bring your own provider.
  • Security-First Configuration – Encrypted SIP (TLS/SRTP where supported), access controls, and fraud prevention.
  • Client-Centric Policies – We operate as your partner, not a gatekeeper—clients stay with us because they value our service.

Whether switching from another phone system or replacing your SIP provider, our approach minimizes downtime and confusion. As a single-stop shop for IT, we implement your requirements efficiently.

While many IT companies mark up VoIP minutes and DID numbers by 300%–500%, AtoZinIT is not a VoIP telecommunications provider. Instead, we help you set up your own direct account with a SIP trunk provider Charlotte businesses trust, giving you wholesale rates at our cost.

Our role? We provision, configure, and maintain your SIP trunks, integrate them with your 3CX system, and act as your technical support team for both your PBX and provider connections - ensuring high-quality, uninterrupted calls. We also provide full 3CX hosting, including maintenance, backups, restores, disaster recovery, certificates, and FQDN management.

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Our SIP Trunking & Number Porting Services

SIP Trunk Provisioning & Installation – Complete SIP trunk setup for 3CX, with providers like Sangoma, Twilio, Telnyx, and more. For local options, we can connect you with Charlotte-area providers like CNP Technologies or BTS Solutions.
SIP Trunk Configuration & Routing – From inbound DID mapping to outbound call rules, we ensure optimal call flow.
Number Porting Services – Keep your numbers when switching systems or providers—local, toll-free, and virtual phone numbers supported.
VoIP SIP Trunk Integration – Full integration with your PBX for local, long-distance, toll-free, and virtual phone numbers.
Business SIP Trunking Support – Ongoing maintenance, monitoring, and troubleshooting to ensure uptime.
Bring Your Own Provider – Already have a SIP trunk? We'll connect it to your 3CX system and optimize it for compatibility.

Our Number Porting Process

When porting your DID numbers from a previous VoIP provider, we make it simple:

  1. Account Setup – We help you open your own account with a trusted SIP provider—your name, your ownership, no hidden fees.
  2. Documentation & Authorization – We handle LOAs, PINs, invoices, and proof of ownership for phone number porting.
  3. Process Monitoring – We track your port request and confirm activation (often scheduled for early mornings like Friday to reduce impact).
  4. Pre-Cutover Configuration – We prepare your 3CX with the new SIP trunk and DID routing so the cutover is seamless, with minimal downtime.
  5. Post-Port Cleanup – We verify call routing, remove old trunks, and ensure everything runs smoothly.

Whether you're moving from another system or switching SIP providers on the same PBX, our approach ensures minimal downtime and zero guesswork. This process is straightforward, but we handle the details to eliminate confusion. Once established, we continue configuring DIDs, routing, and more to meet your needs.

Number Porting Process

Contact AtoZinIT today for SIP trunk services in Charlotte NC or to start your number porting process. We make complex communications simple, secure, and cost-effective.

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Frequently Asked Questions

  • A SIP trunk is a virtual phone line that uses the internet to connect your business phone system (PBX) to the public telephone network, allowing inbound and outbound calls. It transmits voice as digital packets over your internet connection.