FAQ

Do you have questions? Need answers? Look no further than our simple SIP trunking FAQ.

Go trunk is a world leading SIP Trunking solution. A SIP trunk replaces the need for traditional telephone lines to connect your PBX to the Public Switched Telephone Network (PSTN). With SIP Trunking all of your unified communications are delivered through a SIP provider. (A SIP provider is also sometimes called an Internet Telephony Service Provider, or ITSP.)

With Go Trunk you can:

  • Make and receive local calls
  • Make and receive long-distance and international calls
  • Call the emergency services (911 / 112 etc)
  • Make free Internet calls
  • Make low cost local, international and mobile calls

End users probably won’t notice much difference - although they might notice significant improvements in call quality. Business leaders will notice a sharp reduction in costs. And those responsible for overseeing and managing the telephony needs of the organization might find that they have plenty of time on their hands - because getting a SIP Trunking solution set-up and controlling it on a daily basis are both trivially easy.

Great. All you need is an IP-PBX. If you don’t know what that is or what it means then get in touch and one of our consultants will talk you through it.

Other than that, all you need is ten minutes of your time to get the system up and running.

Sign up for an account

Inbound calls are free. Internet calls are free*. Calls to fixed line phones and mobiles are much cheaper. All our prices are available here.

* calls to Toll Free numbers excluded

No, there’s no contract and you are free to stop using the service at any time. This also makes setting up and trying SIP trunking easy, affordable and low risk. Simply create an account and get started.

Any broadband connection will be enough to make use of Go Trunk. Go here for more information and guidance.

You will need your own PBX (private branch exchange) which routes your calls around your organisation. In fact, it needs to be an IP-PBX, although there are ways around this requirement - by adding an Analog Telephone Adapter. Our consultants can help. If you don’t have a PBX, then you would need to purchase one. They are a complex bit of kit and can cost tens of thousands of pounds / dollars. Companies with fewer than around 700 employees are probably better off with a cloud PBX solution which requires no up-front expenditure, no set-up and no maintenance. Our sister service VoIPstudio providers world-leading Cloud PBX solutions.
You can easily bring your existing numbers with you - our simple web portal helps you to set this up and manage everything. Or we can provide virtual numbers in more than 50 countries. Prices for virtual numbers are available here.
Yes, probably. Please get in touch and send us the number you wish to transfer. We will check it out and get back to you within 3 working days.

We support a wide range of codecs, including:

  • ALAW (G711)
  • ULAW (G711)
  • GSM
  • G722
  • G723
  • G726
  • G729
  • speex
  • H264 (Video)

We recommend using G.711u as it delivers the best sound quality, providing you have sufficient bandwidth. If bandwidth is an issue, we suggest you try one of the other codecs such as G.729.

This depends very much on the intended destination of calls. Please contact one of our consultants who will discuss the details and provide clarification.
SIP authentication allows you to challenge any incoming SIP calls and invite the sender to prove they are who they say they are. Needless to say, this is handled automatically by the technology. We provide two methods for authenticating SIP calls and allow you to choose whichever method suits you best. These methods are: IP ACL and password based authentication.
Our Call Detail Records (CDRs) are provided in real time. You can access them easily using an FTP tool.
For payment we can accept both bank transfers and credit cards.
Yes, of course - simply sign up for our free trial. We’ll even give you some free outgoing calls, and there’s no commitment and no automatic renewals.

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You can use our service totally free of charge for 30 days. No credit card information required.

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