No Contracts or Minimums! Provision trunks whenever you need them and only pay for what you use.

Don’t spend hours interpreting your bill and building detailed capacity plans. Transparent, usage-based billing keeps you informed and lets you closely track voice trends.

Data centers in six globally-distributed regions, each connected to multiple Tier 1 carriers guarantees that you will always have a reliable connection!

No Congestion

National SIP offers Premium Call Routing, to deliver all routes at the most cost effective and efficient way possible. We eliminate the congestion so you connect to more customers.

No Commitment

We understand there are many carriers out there to choose from. Let National SIP increase your bottom line with our no hassle easy set up process. Just pay for what you use.

Unlimited Calling

National SIP offers all of our plans with unlimited calling. Whether you are looking for Hosted Business PBX usage plans or SIP trunking, National SIP has you covered.

Personal Assistance

Each one of our premium clients will receive their own personal concierge that will handle all of your customer assistance needs. We are just a call, text, or email away.

Industry Experts

Our team has been servicing inbound and outbound call centers for over 20 years. We keep pushing technology to the limit to offer a smooth, reliable system for our clients.

Great Rates

National SIP offers the lowest rates in the industry. It’s no secret, we exclude the middleman and pass the savings onto our clients. Call today to lower your rate.


Bulk/Wholesale pricing is available for call centers and business with larger minute usage needs. Please contact us for rate tiers.

Basic SIP

Connect to any PBX or Dialing System

United states and Canada Flat rate




Wholesale VOIP

Same High Performing Tier 1 Routes.

Personal customer assistance

Based on volume



Free Hosted Vicidial

Hosted Vicidial Servers available for customers who meet minimum monthly minutes

Contact Us For More Information

We put you back in control with real-time
voice performance monitoring and detailed line-item billing.

SIP Trunking You Can Depend On

SIP Trunking

In addition to VoIP calls, SIP trunks can also carry instant messages, multimedia conferences, user presence information, Enhanced 9-1-1 emergency calls, and other SIP-based, real-time communications services.

Reliability You Can Trust

National SIP servers are hosted on the most secured and reliable servers in the nation.  Our platform is used by many high profile gaming casinos ensuring the best connectivity and efficiency rate.  We offer the best concierge program in the business to make sure you’re always up and running.  With over 30 different carriers and a personal assistant, National SIP will ensure you are always dialing.

Bundled Services

National SIP specializes in SIP Trunking but offers several value added services.  National SIP also offers data, hosted pbx systems, business VOIP, Vicidial connection, cloud storage, complete turnkey solutions, etc.  Call National SIP today to see how you can save money on bundling services.

Stop Paying More For Your Minutes Today. Call Us Now!


We look forward to adding your company to our list of satisfied customers.

Katie S.

Florida Call Center

Our company has been using several carriers and experiencing the same results.  We now use National SIP as our main carrier and our connectivity is so much better and our price per minute has dropped significantly.  Keep up the great work.                        

Jim P.

Spokane, Washington

I have had plenty of carriers in the past, some good and some horrible.  It’s hard to find a company that can offer both great service and competitive pricing.  Thank you National SIP, your concierge program is the best customer support system I have ever encountered.                           

Sherry A.

Richmond, CA

Our company is based on bottom line and bottom line only.  We look for the lowest price possible on 3rd party vendors.  We had been using another company for 2 years before making the switch to National SIP.  They now handle all of our sip trunking and PBX hosting while saving us money.         

See our new Dashboard and how easy it is to navigate!

National SIP offers the easiest dashboard to navigate in the industry.  With all the most important fields on one page, we make it simple and convenient to change campaigns and access reporting with just a few clicks.  Check out our demo to view what we have to offer.

Simple Integration

National SIP is proud to offer the most reliable and customizable SIP trunking services on the market.  Our experienced team of engineers are able to customize and bring your call center needs to a reality.  Whether you need specified reporting or unique call routing National Sip can handle it all.

New Data Centers

National SIP helps 11 new call centers in January 2018 with a turn-key solution utilizing customizable services to maximize connectivity.  3 out of the 11 clients were start up call centers and the others were existing centers that have expanded using National SIP services exclusively.  The SIP Trunking services that National SIP specializes in has dropped rates significantly for call centers all over the nation.


International Call Centers

If your call center is located outside of the US as many call centers are, then call or email National SIP to get the best rates on dialing the US.  National SIP opens their international division in late 2017 to offer their customizable services to centers that are dialing to the US.


Free Hosted Vicidial Plans

National SIP now offers FREE hosted Vicidial plans to our clients using our SIP Trunking services.  If you’re a call center or a business that relies on stability and reliability, then our Vicidial builds are your best solution! Contact us today to learn more about this program.


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Phone: 800 887 1429