SIP.US Reviews

Pros

At least it connects properly with Zoiper but beyond that it has felt like a complete waste of time waiting on the service I already paid for.

Cons

Even after my payment went through, the account was still left in demo mode which is why I had to submit a support ticket. I also called customer service but the man who answered told me he couldn't help with getting my account set up. At this point, I'm clearly very dissatisfied.

Pros

It's very simple to use, requires little upkeep and helps the company cut costs.

Cons

There are occasional outages that cause some downtime although it's still more reliable overall.

Pros

Getting started was quick and the portal is easy to navigate without any confusion.

Cons

Support around the hosted PBX can be frustrating at times. When I need assistance, I sometimes end up going back and forth between SIP and our phone system provider before getting things resolved.

Pros

The documentation they provide for different PBX systems makes the setup process feel effortless.

Cons

The customer portal comes across as a bit disorganized to me. I've had to click through the menus for a few minutes just to locate something and I even had to submit a support request once to find an option on the website.

Pros

This software is simple to get started with and set up. Whenever support was needed, the help was solid and responsive.

Cons

At this point, I haven't run into any downsides or issues to mention.

Pros

Getting this software deployed was the part I appreciated most since the setup was very quick.

Cons

We've been using it for six months and haven't run into any real problems.

Pros

Their team being based in the US was a plus and the free trial gave me a chance to test the service without any commitment. The setup during the trial was also pretty easy which made getting started pretty convenient.

Cons

Once the onboarding process moved forward, I was given additional setup details that had not been mentioned during the trial review or implementation stage. After going through the FAQs and knowledge base, I contacted support about the problems I was running into but their response felt condescending rather than understanding and they were not very helpful in trying to resolve the issue.

Pros

Ordering and getting everything in place was simple and I had my phone system configured and making outbound calls in about an hour.

Cons

It worked well with my Mitel system although I did run into a few registration issues. Still, they were fairly minor overall.

Pros

Calls have been working well and we've been using the service for several years with consistently good call quality so overall we've been satisfied on that side.

Cons

The problem has been with the SMS feature. I enabled it at the beginning of this year and even now I still haven't been able to use it. I opened a support ticket back then and it remains unresolved to this day. After waiting for weeks, the only update I got was a brief note saying they were working on it. Eventually I stopped following up and started using RingCentral in parallel instead. If this continues, we may end up switching completely because no one can afford to wait years for a fix.

Pros

After a rough experience moving from POTS/ISDN to SIP with another provider, switching to SIP.US was a much better process. They made the number porting far simpler and even took care of dealing with an uncooperative telco. The website management tools are excellent. Keeping e911 information up to date when people change locations is as easy as entering the details and clicking save. Their support portal is user friendly and the responses are very quick. I also appreciate how simple it is to review the detailed billing.

Cons

Something that could be better is the trunk capacity alerting. Instead of getting a notice that the limit was exceeded at some point earlier in the month, I'd prefer near real time notifications with the exact date and time so it's easier to adjust trunk capacity as needed.

Pros

It didn't take long to get this service up and running and it has been rock solid ever since. There was a full guide that walked us through connecting our Grandstream UCM PBX with this and they also included a phone number with the service. The redundancy options are a big plus and the call quality has been absolutely fantastic.

Cons

It's per minute rate for toll free calls could be a bit lower but honestly that's only a small issue. Overall, the experience has been excellent.

Pros

Using this platform for our business has been a really solid experience. We only rely on one trunk and after the initial setup, there's basically nothing else to manage. It just keeps working without any need for ongoing changes.

Cons

There really isn't anything that has caused problems for me. We only use the trunk service and also ported over a few numbers and everything has been fine.

Pros

Everything is easy to use, the explanations are well done and the website feels clear, simple and well organized.

Cons

Honestly, pricing is on the expensive side and I still can't create a separate sub account for each of my clients under my own name.

Pros

One of the biggest advantages was the cost savings and I really appreciated that the sales reps kept things low pressure. I was originally planning to go with a different provider but their team kept calling nonstop to push me into signing up even though the hardware still wasn't ready.

Cons

The weaker areas were the limited feature set and the lack of solid documentation.

Pros

Right from the start, it worked well with our Asterisk PBX. The customer portal is well thought out and after using the service for years, the uptime has consistently been excellent.

Cons

Back when we had a toll free 800 number, we needed to prepay in dollar blocks for those calls which made accounting a bit inconvenient. Since we no longer use the toll free number, that issue is no longer relevant.

Pros

After more than four years with this service, it's continued to do exactly what I need. It's simple to work with and handles the job really well. I've used it with X Lite, Cisco CME, Kerio, Cisco phones converted to SIP, GrandStream and other setups without trouble. The setup documentation is clear and simple to follow which makes configuration much easier. Since I work as a consultant and travel constantly, being able to stay connected from wherever I am has been a huge benefit.

Cons

Only hiccup I ran into was some address validation trouble while setting up billing but one phone call to support took care of it right away. Outside of that, the service itself has been problem free.

Pros

During our setup, the technical team at SIP.US coordinated directly with our Cisco technician in Austria and they managed to get both of our North American plants up and running earlier than planned.

Cons

I came into this with no background in SIP so it would have helped a lot if there had been a basic primer available for people who are new to the subject.

Pros

Getting the SIP trunks configured with this system was easy. The support team has been outstanding, with helpful guides and hands on assistance when it came to setting up our equipment. They were also open to working with us on custom solutions.

Cons

Everyone at SIP has been helpful throughout the whole process and I really don't have any complaints at all.

Pros

We were able to get everything set up and working pretty quickly and that's definitely one of the best things about this service.

Cons

The connection with Argentina could be better. At times, you can't hear the person on the other end of the call.

Pros

Having direct control over call routing is a big plus. It gives customers the ability to manage how calls are handled without relying on someone else to make changes.

Cons

There are still compatibility and support issues when trying to connect with certain IPPBX routing systems, including Ward Mundy's IncrediblePBX software running on the customer's preferred computing platform for better cost savings and broader feature support.