Using SIP.US, I was able to lower my monthly phone costs by 10s of thousands of dollars per month.

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.

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.

When I happened across SIP.US in a google search on the weekend when our physical phone system crashed and we had to build a virtual one quickly and get it up and running before Monday, I had never used SIP trunks before. I had not used them because I was unsure of the technology and worried about call quality, the phone company always wanted to bring in a separate circuit to run SIP trunks (more bureaucracy and red tape). SIP.US was fast and easy to get going and JUST WORKS! We enjoy great call quality with SIP.US and have the flexibility to add and remove phone numbers and trunks at will. We can respond to market conditions instantly scaling up or down at will. I wish I would not have waited so long to give this service a try it really does change the way that we think about voice service. I suggest using the free trial and just giving it a shot, once you sign in and see the portal and all that you can do INSTANTLY you will be hooked.

SIP.US is very quick and easy to set up and use. I set it up at around 10pm on a weekend when our phone system had died and we had to recreate a virtual one that could not connect to our existing PRI. Without talking to anyone I had a SIP trunk up and taking calls in less than half an hour without having any previous SIP trunk experience. The next day (on a weekend!) I received a call from the executives at SIP.US to make sure I had everything that I needed. The support team proceeded to help us get all of our numbers ported as quickly as possible (you can do this from the web portal but they were just being nice.) Once I understood the ease of use (no calling and waiting for the phone company to wait through their bureaucracy), reliability and clarity of using SIP trunks through SIP.US I could no longer imagine relying on a traditional phone company for phone service. SIP.US is a game changer, we have never looked back. SIP.US is how phone service should be.

I have not found anything to dislike. SIP.US does what it says it is going to do and keeps on doing it. Full control of my phone service from a web browser, what's not to like?

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. after weeks one line appear that we are working on it so I stopped asking and started a parallel service Ringcentral and in future we may move ourselves to Ringcentral coz nobody can wait for years.

Yes calls are working fine. we are using from multiple years and happy with call quality.

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. after weeks one line appear that we are working on it so I stopped asking and started a parallel service Ringcentral and in future we may move ourselves to Ringcentral coz nobody can wait for years.

SIP.us allowed me to be operational on multiple platforms. Integration is simple, number selection is good, and implementation is fast. I had a client that needed to LNP 100 DID's and get services up quickly...SIP.us team had me up and working within 2 hours. The numbers were ported very quickly with no issues.

It's easy to use and it gets the job done. I've been using the service for over 4 years and it's been fantastic. I use it with X-Lite, Cisco CME, Kerio, Cisco phones converted to SIP, GrandStream, etc. The documentation around setup is easy to follow. I'm a consultant and i travel all over and i'm able to connect where ever i go.

I've had a few issues with address validation when setting up billing...but i made a phone call and support resolved it over the phone. I haven't had any issues with service.

Have been connected to SIP.US for many years. They've updated the web site to make it even friendlier and self-service is a snap. The only issues I've run into were local to my network & ISP but the support team was able to provide enough clues as to likely cause that I was able to get things up and running.

I have a home lab with a couple of Asterisk servers. Provisioning trunks & numbers is a breeze. I do contract work for businesses in London & Auckland and setting up a local DID is super helpful. Since my usage is quite variable I really appreciate the prepaid pay for what you use plans.

Haven'r run into any snags. I would appreciate SMS options for significantly less cost (although I haven't looked into this in a while).

SIP.US gave us the ability to provide VOIP managed services without needing the expensive and complex trunking issues. I have always been confident in transferring the phone numbers to sip.us.

The timely support when I was having issues with my software or my clients software interfacing with sip.us was invaluable. They contacted me directly when there was an administrative (billing issue), which was appreciated. I also like the flexible services and ability to setup trunk accounts.

I'd like to see some advances in encrypting the sip traffic and the ability for me to resell trunk accounts to my customers

Sip.us easily integrates with our Asterisk PBX. Their customer portal is simple and straight forward to use. We have been using them for years and their uptime has been excellent.

When we had an 800 number, we had to pre-pay blocks of dollars for those calls. It was awkward from an accounting standpoint. We don't have the toll free number anymore so that is no longer an issue.

Obviously using them for seven years the overall experience is good. There is room for improvement, but management hasnt seemed interested in making improvements.

Fairly simple to implement. Over the past seven years I have used the service it has been very reliable.

Billing can be a bit confusing and customer service a bit difficult at times. This situation has improved over the years however. You have a mix of prepaid and billing which can cause confusion and extra steps. DID billing doesnt come out of prepaid funds like most services. It is billed seperatly and cannot be prepaid.

-Instant provisioning -Extremely simply setup -Intuitive, feature-rich user interface -Great, responsive customer support

-International rates tend to be on the high side

After nearly 5 years the internal SIP.US team continues to be a thought leader when we need new solutions. It happens often that we present an idea and they say "we have been working on that" and they can show us examples of their progress. Priceless.

The portal for searching for available numbers is very easy to use. We have even integrated our Slack channel into the product so that Sales personnel can use it with the clients.

At this point there is nothing that comes to mind regarding "least liked".

SIP.US was our choice for SIP trunking when we cut ties with a bundled managed service provider. The service level has been outstanding, availability being something we take for granted. Their customer service and support are refreshingly effective, which can be rare with traditional telecom.

Ease of use to convert our SIP services over to a new provider. The porting process was seamless, the customer service communication was effective, and the after cutover support has been stellar.

Nothing I can think of offhand. Perhaps additional reporting aside from just call records. For example a channel utilization report.

Great

Easy to set up, I'm an avaya guy and simple to setup, had a few issues but the tech support guy was awsome. I feel the YouTube videos made were because of me and avaya issues. But working great and has been for a long time. I have set up a few customers with sip.us for cost savings

Only issue is with web portal, the size format is wrong you have to do a lot of mousing to get to submit buttons but that's it.

I am overall happy

Easy to set up and the portal is easy to navigate

The support with hosted pbx. Sometimes when I need help I have to go back and forth with support between SIP and our phone system provider.

Overall SIP.us has been great. I continue to do business with them because of the quality of the service

Ease of use, and a user-friendly control panel

Price per channel is my only complaint. It can get pricey during my peak season when i turn up my channel count

This system eliminated wired telephones and central station.

It has clear sound for phone calls. Options can be aded or replaced from the Intenet login without involving SIP personnel.

Why can't we use this system for faxes?

Have used them for years and have been happy with the quality of service, support, at a reasonable price.

They have reasonable pricing; good support; and easy to use service

They have very basic features for SIP Trunking

Saved money and had a better experience

Easy to use, very friendly staff if I ever need help with anything

Nothing. It’s a great software interface that saves us a ton of money. I have no cons.

Sip.us sip truck was easy to set up with my freepbx system. Customer service is also excellent with any questions.

I don't have any complaints about sip.us.

Ease of connectivity with FreePbx, etc. Top quality over VOIP.

Liked Everything!! Pretty much took an hour or two setup the trunk.

Easy to setup and great Support. Easy billing

No real Cons. I have been very satisfied.

Very easy to use

very easy to work with, some times there can be issues because of bad connection and the speed of internet is lagging

Internet not fast enough to handle large amount of calls

No more problems with our phone system,

None, everything was easy to install, no problems for our IT team

Sip.us provides good quality SIP truck lines for my custom asterisk server. They seem to work well, and I don't have any complaints.

I don't have any complaints about my SIP trunk line as of yet.

SIP.US has just been a rock-solid piece of our PBX that serves over 500 users.

Easy to use, very reliable as an add-on to our SIP Trunks

We had to do come custom configuration to get it to work with our PBX. But after that, no issues.

Evaluated and then selected SIP.US for my clients that wanted to get off a legacy phone system. Service questions were answered immediately, setup was close to real time. The service integrated into FreePBX/Asterisk with no fuss and has been rock solid. If you are looking for a simple self-service SIP provider SIP.US is an excellent choice.

Quick setup, rapid response to both pre-sales and post-sales questions

Haven't found any down side to using SIP.US, they are a great group to work with.