# SIP.US Reviews 2026. Verified Reviews, Pros & Cons | Capterra > Is SIP.US the right VoIP solution for you? Explore 85 verified user reviews from people in industries like yours to make a confident choice. Source: https://www.capterra.com/p/186600/SIP-US/reviews --- SIP.US 4.7 (85) [View alternatives](https://www.capterra.com/p/186600/SIP-US/alternatives/) Provider data verified by our Software Research team, and reviews moderated by our Reviews Verification team. [Learn more](https://www.capterra.com/our-story/) * * * Last updated March 13th, 2026 # Reviews of SIP.US Ease of use 4.5 Customer Service 4.6 ## Pros and Cons in Reviews RH Robert H IT DirectorGovernment Administration, 201 - 500 employeesUsed the software for: More than 2 years. “Using SIP.US, I was able to lower my monthly phone costs by 10s of thousands of dollars per month.“ May 19, 2022 SR Shafiq R Director InfrastructureComputer Software, 201 - 500 employeesUsed the software for: More than 2 years. “I enabled sms feature I think from start on this year and I am unable to use till today, I have opened a ticket from that time and ticket is still open but no resolution.“ May 19, 2022 RH Robert H IT DirectorGovernment Administration, 201 - 500 employeesUsed the software for: More than 2 years. “SIP.US made the port much simpler and handled the interaction with an uncooperative telco.“ May 19, 2022 MK Michael K PresidentInformation Technology and Services, 2 - 10 employeesUsed the software for: Less than 6 months. “After reviewing their FAQs and knowledge base, I reached out to support pertaining to the issues and they were very condescending instead of being empathic to issue and trying to provide assistance.“ May 24, 2022 AD Aaron D IT DirectorHospital & Health Care, 51 - 200 employeesUsed the software for: 1-2 years. “The ease of setup was fantastic and the documentation that they make for different PBX system makes setup a breeze.“ May 27, 2022 SH Sharon H AccountantAccounting, 2 - 10 employeesUsed the software for: Less than 6 months. “I had to leave as I cannot afford another glitch, to upset my customers“ May 31, 2022 sC scott C Network adminMental Health Care, 2 - 10 employeesUsed the software for: 1-2 years. “It was easy to order and implement had my phone system set up and making outgoing calls in about 1 hour.“ May 24, 2022 pd parsana d AdministratorHospital & Health Care, 201 - 500 employeesUsed the software for: Less than 6 months. “I didn't feel like the tech support was as good as it could be.“ May 19, 2022 ## Showing most helpful reviews Showing 1-25 of 85 Reviews Sort by: Most Helpful Rating Company Size Reviewer's Role Length of Use Frequency of Use Paul A. Co Founder Computer Software Used the software for: 2+ years ### "Great for trunks and hosted Asterisk" June 4, 2019 5.0 It provides an automated IVR service for our clients, and routes inbound calls to our operators. Pros We have had a hosted asterisk service with SIP.US for almost 8 years and we liked that we have been able to add custom code to our service to be able to better meet our needs Cons There hasn't been anything that I would describe as a con. Review Source KD Kimani D. SaaSOps Engineer Computer Software Used the software for: 2+ years ### "Mostly good, some missing features" June 5, 2019 5.0 Overall we are very happy with the SIP.us solution. We have contractors all over the world, so having the ability to call people all over Pros \- Ease of integration with the PBX (we use Asterisk) - Clear user guide and documentation Cons \- Mostly good for calls made to North American and western-European numbers. Not so good for international calls, especially to some countries - India, Russia and some Eastern-European countries (Romania, Bulgaria, Armenia come to mind). Some providers in these countries seem to detect that our calls are Voip calls and block them. And we have raised this issue with SIP.us, but received no feedback. This means we have to spend more money making phone calls via Skype. And Skype calls are expensive but always go thru, unlike calls made via Sip.us trunk lines. Now, I understand you may say it is not your fault that telcos are blocking calls made thru SIP. But from my PoV as a customer, what I see is simply that Skype-made calls work where SIP-made calls are failing to go through. So what is Skype doing that SIP cannot? Reason for choosing SIP.US We have not exclusively chosen SIP over SKype. Rather, Skype complements the one area where SIP still fails us - making calls that are blocked because some telcos detect them as Voip calls. Review Source RM RODNEY M. CEO Accounting Used the software for: Less than 6 months ### "UNSATIFIED CUSTOMER " June 27, 2025 1.0 so far terrible service, with little to no feedback. This is definitely not what I was hoping for in a company. Pros They merge successfully with Zoiper other than that so far i have complete wasted my time waiting for the services i paid for. Cons I Paid for the services and i even wrote a ticket because their services still have me in demo mode after payment was received. I tried calling the customer service number, guy male who answered stated he can't assist me with the setup of my account so far, I'm definitely dissatisfied Review Source David L. Software Engineer Telecommunications Used the software for: 2+ years ### "Fantastic SIP Provider With Excellent Technical Support" June 5, 2019 5.0 We use SIP.US as the phone provider for our office's 40-extension phone system. We currently have toll-free and local numbers (DIDs) with them as well as some fax numbers. Pros \- Completely self-service website. - Fantastic technical support that responds within minutes, usually. - Automated number port-in process. - Huge inventory of DIDs across the country. - SMS service is available on most DIDs. Cons \- Website is a little outdated. - Pricing is just fair, not great. Alternatives considered [Flowroute](https://www.capterra.com/p/176093/Flowroute/)[Bandwidth](https://www.capterra.com/p/167939/Bandwidth/)[Twilio](https://www.capterra.com/p/180158/Twilio-Communications-Platform/) Reason for choosing SIP.US Friendliness of support agents and instant account activation. Review Source JT Jason T. Network Administrator Hospital & Health Care Used the software for: 6-12 months ### "SIP.US VOIP Service Review" May 19, 2022 5.0 Pros This service was very easy to setup and has been rock solid. There was a complete guide on how to setup our Grandstream UCM PBX with SIP.US and SIP.US also provided a phone number with the service. They have redundancy options and the quality of the phone calls are just fantastic. Cons The toll-free cost per minute could be cheaper but really that's a minor issue... the overall experience has been excellent. Alternatives considered [VoIP.ms](https://www.capterra.com/p/203084/VoIP-ms/) Reason for choosing SIP.US We use both - but our main product is SIP.US - the reason being is that it has been very stable and dependable. Review Source GP Grant P. IT Director Retail Used the software for: 2+ years ### "SIP.US for Backup Phones" June 4, 2019 5.0 We use SIP.US to handle our calls and send them to voicemail when our main line is down. They have worked great for that purpose, and thankfully we don't have to rely too heavily on their service. Pros SIP.US works great for our backup phones. We use it irregularly, which means our main phone system is working, so that's good. The UX seems to have gotten a face lift recently, so I have been exploring it a bit to see if there are new features. Cons The UX can be convoluted at times. Sometimes a person we had on backup phones ages ago will still get a call, and I have found it difficult to get him removed. Alternatives considered [Twilio](https://www.capterra.com/p/180158/Twilio-Communications-Platform/) Reason for choosing SIP.US SIP.US offered us the best flexibility, and the option to pay for what we use. Most other options would have a base cost that exceeded what we wanted to pay. Review Source PI Pablo I. System Analyst Computer Software Used the software for: 6-12 months ### "Easy and Expensive" May 19, 2022 5.0 So far so good Pros Easy to use, well explained, website is clear, simple and organized. Cons Expensive, I don't have the ability to create sub-account for each of my clients under my name. Alternatives considered [Twilio](https://www.capterra.com/p/180158/Twilio-Communications-Platform/) Reason for choosing SIP.US Twilio has so many services and I was confused at the beginning, Sip.us was simple and clear to understand for a beginner Review Source CM Charles M. IT Solutions Developer Information Technology and Services Used the software for: 2+ years ### "Your experience may vary" June 12, 2019 3.0 I inherited the phone system from the original individual whom had passed away prior to my being hired. Though the user experience has changed with an overhaul over the main site itself, there are still many things that are a pain to do. The bills are also very vague & fixing charges has been a massive pain. Items will have generic listings and refer to something you wouldn't have even thought of. I've tried since January to get credited for an item I was told was 1 thing but turns out it was something we no longer had and while it was removed, the credit was never applied. Weeks can go by without a response to a query or action is taken without a response back. Part of these issues could very well be that I am not the primary on account, but I am the one that handles it. Improving the communication could possibly do wonders for the business as a whole. Pros You can login via root and make changes to system via command line. This can be a big plus if you're wanting to make custom edits or security changes to the system to meet your companies' needs. Cons The servers were not kept up to date by provider as I was told they would be, so our software has fallen too far behind the current available branches to update. This mostly means I have to keep within specific lines of phones and forced to manually deploy each new phone. This also means that I don't have access to command line tools I would normally have to trouble shoot connection issues the OS is way out of date as well and can't be updated without a massive headache which I haven't found to be worth the effort. Review Source RH Robert H. IT Director Government Administration Used the software for: 2+ years ### "SIP.US as SIP Trunk Provider" May 19, 2022 5.0 Using SIP.US, I was able to lower my monthly phone costs by 10s of thousands of dollars per month. Pros I had poor results transitioning from POTS/ISDN to SIP with another provider. SIP.US made the port much simpler and handled the interaction with an uncooperative telco. The website management capability is outstanding. Updating e911 data as people move locations is as simple as entering the info and clicking SAVE. The support portal is easy to use and very responsive. Detailed billing is easy to view. Cons The one are that could be improved is notifications when you exceed trunk capacity. Rather than a notice that you exceeded it at some time in the past month, I'd like something closer to real-time notification with time/date to allow me to better adjust my trunk requirements. Review Source VR Verified Reviewer CTO Information Technology and Services Used the software for: 2+ years ### "Setup and forget and it just works" June 5, 2019 5.0 Easy setup with 3CX hosted in the cloud and provides a cost effective Cloud phone system Pros Once it is setup which is really easy and great guides on the website it just works and we've had no issues. Cons Nothing really. Everything just works and we've had no issues Review Source JS Jon S. Owner Media Production Used the software for: 2+ years ### "Happy User" June 5, 2019 5.0 I was referred to them and used them to set up my trunks for my phone system. It was easy to set up and I havent encountered any problems. Pros It was easy to set up and after a couple of years of using it, I have never had a problem with it not working. Cons Can't think of anything. It was easy to use and there were no problems with it, even a couple of years later Review Source NS Nick S. Director Remote I.T. Entertainment Used the software for: 2+ years ### "Easy Sip Trunks" June 26, 2019 5.0 Pros It was easy to setup the SIP trunks using this system. The support team at SIP.US is outstanding they have guides and will assist you with setting up your gear. Also willing to work with you on custom solutions. Cons There is nothing I didn’t like everyone has been very helpful. Reason for choosing SIP.US Reliability and 24 7 support Review Source FB Fletcher B. Network Engineer Information Technology and Services Used the software for: 2+ years ### "Good quality SIP provider for the money" June 4, 2019 5.0 SIP.us has been a great addition to our business and we look forward to a continued partnership. Pros Great end user platform, setup is easy for FreePBX with little or no problems. Fax works out of the box as well. Cons I have not changes that I would make. The platform is great as is, but all R&D is welcome. Review Source MS Mitchell S. Manager of Information Technology Airlines/Aviation Used the software for: 1-2 years ### "Amazing No-nonsense SIP Trunks" June 12, 2019 5.0 Pros \-Instant provisioning -Extremely simply setup -Intuitive, feature-rich user interface -Great, responsive customer support Cons \-International rates tend to be on the high side Switched from [Vonage Business Communications](https://www.capterra.com/p/159047/Vonage-Business/) Expansion requirements. New PBX Equipment Review Source GG Greg G. Atty Legal Services Used the software for: 2+ years ### "Great support " June 5, 2019 5.0 Great service great prices Pros The support team is pro and always delivered everything they promised. Service works well. Thanks for the many years of help and support. Cons It is difficult to learn asterisk and how to handle your own trunk. Review Source BF Benny F. Operations Manager Hospitality Used the software for: 2+ years ### "Great Customer Service" June 5, 2019 5.0 Pros The customer service dept is top notch. They are very knowledgeable and even when your phone vendor is giving you a hard time, they find a way to fix or create a workaround. Cons They price could be a bit more aggressive. Review Source GM Gregory M. senior network manager Information Services Used the software for: 2+ years ### "best value for SIP providers" June 5, 2019 4.0 We use SIP trunking from SIP.US for our three offices. it has reduced our cost over land lines by 75% Pros The ease of set up and the value for the money Cons selecting phone numbers. Wish they would let you know what area each exchange is for Review Source AR Adam R. President Telecommunications Used the software for: 2+ years ### "My review " June 4, 2019 5.0 Saved money and had a better experience Pros Easy to use, very friendly staff if I ever need help with anything Cons Nothing. It’s a great software interface that saves us a ton of money. I have no cons. Review Source LA Leo A. CEO Computer Networking Used the software for: 2+ years ### "SIP.US was a Godsend" June 4, 2019 5.0 Pros Safe, secure and easy to set up and mould with our clients needs. Cons I have yet to experience any issues with SIP.US in the several years I've used it. Review Source TB Tyler B. CIO Real Estate Used the software for: 1-2 years ### "Easy to setup and get going" June 12, 2019 5.0 Pros Super easy to setup an account and purchase numbers. Ability to set CID and 911 information. Customer service is quick with responses. Cons International Calling is a little tricky. Reason for choosing SIP.US How quick and easy it was to setup an account and just get it working. Review Source KW Kenneth W. Owner Computer & Network Security Used the software for: 1-2 years ### "Great price!!" June 4, 2019 5.0 Had a problem setting up with my phone system (Xblue).... they were very helpful when i called and was working in 5min! Pros Easy to use and navigate. Call logging is excellent Cons Nothing negative to write really. The service is always working and price is more than right! Review Source EV Elizabeth V. Operations Manager Medical Practice Used the software for: 1-2 years ### "No huge bills to go through " June 12, 2019 4.0 Very easy to use Pros very easy to work with, some times there can be issues because of bad connection and the speed of internet is lagging Cons Internet not fast enough to handle large amount of calls Review Source CM Chris M. Manager Retail Used the software for: 1-2 years ### "2 years" June 4, 2019 5.0 Pros It just works. Never had any down time with it Cons Don't have any complains after 2 years of using it. Review Source JH Justin H. President Computer & Network Security Used the software for: 2+ years ### "Easy to use, But not as primary " June 4, 2019 2.0 Pros Easy to use and setup. Customer service is great. Great team to work with. Cons Failures, issues and downtime: Too many to deal with for a service provider, lost VoIP clients due to Sip.us downtime that took too long to resolve. Cost of product is at a premium, yet quality of product is not. Review Source NA Nishaan A. It manager Computer & Network Security Used the software for: 6-12 months ### "Best service" June 4, 2019 5.0 Pros I tried lots of companies before sip.us. But after sip.us my searching has stop. Very happy doing business with sip.us Cons User interface could be better. So it would be easier to use it. Review Source Similar Products Featured