SIP Trunks and VoIP Lines

We offer a simple Pay as You Go SIP Trunk (with optional add-on subscriptions to save even more). Trunks can either be based on username/password based (for a single desk/softphone) or IP Authentication (i.e. for a PBX etc). We can also support PBXs as a username/password option, but recommend you using IP Authentication if you can.

PAYG SIP Trunks & VoIP Lines:

Your account can contain SIP lines, SIP Trunks and Dedicated Number Redirects (what we call a connection)

  • Instant Setup (Activated same day within office hours on receipt address/ID)
  • From 0.4p/min Landline
  • 1.25p/min Mobile
  • Your first 03 & 0800 number is free!
  • Each trunk comes with a dedicated free 03 number
  • Competitive Rates and High Voice Quality
  • Unlimited Channels (We start you with 10, please request more if needed)
  • SIP Based
  • Support T38 Fax
  • Voicemail 2 Email (if setup as a line, rather than trunk)
  • Fax2Email
  • Works with any SIP phone or SIP PBX
  • Encryption using SRTP
  • Redirect your phone number to another or voicemail if unavailable/VoIP Connection is lost for failover
  • Send your own Caller ID (if you own the number and sign a CLI Agreement)
  • Multiple CLI Options (Withheld, select a DID you own etc.)
  • Prepay via Bank Transfer (Automated Top-ups)
  • Prepay via Credit or Debit Card (only to be used for emergency top-ups or low spend users)
  • One billing account can have multiple trunks (ideal for reselling)
  • View Calls Online in Real Time with Stats
  • Access to Emergency Services (You must keep us updated with your in use service address)
Important: Services are for United Kingdom customers ONLY.

All Accounts allow the following:

  • Multiple Connections (interconnects)
  • Fax2Email
  • Routing options for your inbound numbers (i.e. on no answer, busy, failed e.g. site failure)
  • View Call Records with full info (i.e. which IP and connection originated the call etc. to assist in reselling)
  • A real time global call map to see where your calls are going in real time
  • Fraud Management to limit your max spend per minute on a call and your max out of inclusive addon allownance per day.

How do I pay for my account?

  • Accounts are prepaid. We provide a small amount of test credit to allow you to make some test calls and a free number to make sure you can receive calls.
  • We allow customers to prepay via 2 methods: Debit/Credit Card (limited to £10+VAT per month) and automated bank transfer.
  • Bank transfers are done automatically by payment reference. You are provided a unique reference inside your control panel. Make sure you send this reference when sending a prepayment as bank payments are automatically applied twice a working day (morning and afternoon).
  • We recommend you use card payments as an emergency topup option while you wait for funds to clear.
  • Note: Customer who spend large amounts can have their £10+VAT per month card limit increased to an amount that is reasonable to cover the time it may take for a bank transfer to clear.
  • We are Faster Payments enabled.

Techical Information on our Services

Before contacting us, please read the information below. Since the start of our service provision, we've received many questions on a broad range of subjects. Responses to typical queries and requests are listed below to help you. Further information can also be sort in our knowledge base.

Different Routing Options

Sending calls is similar to calling from a physical landline

Dialling UK Numbers

Dial simply in national format. I.e. dial 0123456789 for the number 0123456789 or 0791234567 etc

Dialling International Numbers

Dial with 00 + Country Code + Local number. For example, for the number 912345678 in Spain, Dial 0034912345678

Important: Make sure you have enabled your connection to be able to call international numbers (by default, SIP and VoIP Connections can only call national)

Customer Requirements

This service is for UK customers only. Customers outside this region will not be applicable for an account.

You must have some basic knowledge of SIP and VOIP to use our service. We are unable to provide in-depth technical support.

You must only use our service in the UK. Connecting from outside the UK may not work.

Technical Requirements

For successful high quality calls and reduction of issues, we recommend the following requirements

  • Must have 100kb/sec upload/download for each concurrent calls
  • Must support SIP to ITU standards (Asterisk, Freeswitch, Cisco, Linksys, Grandstream Dialogic etc. and most phones and software do.)
  • Send calls in local or international format (local format. i.e. 0123456789 / International Format: 0044123456789)
  • Send CLI in +E164 Format (international format. i.e. +44123456789)
  • Support G711 A/U law

Account Defaults

When an account is created, it is created in default format. We offer lots of features, however you must request that we enable/activate these. When an account is created, it will be created with the following defaults which are designed to work with the broadest range of devices with as little as possible configuration from the customers end.

  • Registration based VoIP Line/Trunk (i.e. we provide you a SIP username/password or IP Authentication)
  • Call routing is set only to national (you must select unrestricted to allow international calling)
  • Calls are routed of UDP (Signalling 5060, RTP 10,000 > 20,000) (Standard SIP ports for most SIP equipment)
  • T38 Fax is Enabled
  • SRTP (with TLS) is disabled
  • Voicemail is Enabled
  • Fraud Settings are enabled (Set to 20p max. per minute and max. £10 per day spend on calls). Contact us if you require these to be changed.

Discount on Volumes

Historically, VoIP Yonder has spent too much time customising rates for forecast volumes that were not fulfilled by customers. Therefore we have changed our approach.

VoIP Yonder offers a scheme for customers to top-up £250 GBP or more and spend this within a calendar month, then 10% extra credit is provided at each subsequent top-up when this condition has been met.

This must be requested at each top-up for us to clarify you've met the conditions and for us to apply the extra credit.

If a customers spend is substantially more than this, then custom destination rates maybe applied.

Prohibited Calls

Aloha/VoIP Yonder operates purely in the premium, high quality end of the market and will avoid any clients that degrade our network for our other clients. We pride ourselves in providing a high quality service/network . Also we have regulatory commitments to adhere to. If your traffic meets one of the following conditions below we will be unable to assist you:

  • Automated/Predictive Diallers
  • Low ASR/ACD (i.e. a minimum of 50%/50 seconds respectively is required) - including data cleansing and short call durations
  • Marketing Calls
  • AIT Calls (Artificially Inflated Traffic)
  • Nuisance Calls
  • Spam, Spoofing or anything else which can cause harm or be deemed illegal or not making good use of a communications network


Support for trunking is limited. We will provide destination support in the rare case there are quality issues. However we expect all customers to be able to have the technical understanding and know how to handle their setup with their trunk. We offer a comprehensive knowledge base to getting started.


It is the clients responsibility to make sure their SIP details are safe. If you feel SIP details have been compromised or do not recognise calls in your account, you must inform us immediately. You can reset your SIP password online. We recommend customers use a firewall and IP Authentication only connections. To help reduce fraud and loss, all new accounts are setup with a max call rate and daily call spend which can be viewed in your control panel. These can be changed or remove on request by opening a support ticket. In addition, SIP and VoIP Connections can be restricted to UK calls only (default) or include international calls.

Important: Make sure you secure your equipment and keep it upto date. VoIP hackers exist and attempt to make calls to expensive numbers leaving businesses to pay the bill. Google Toll Fraud for more information or seek professional advice to make sure you keep yourself secure. Our services do contain tools that allow you to limit the maximum call spend per minute and the max spend per day.


To increase security, we recommend you connect your equipment using TLS transport and SRTP encryption to encrypt both the signalling and media between us and you. When selecting SRTP, it will only work if the transport TLS is also enabled.

If you have a query about our service or how to migrate from your current setup to us (it’s easier than you think) then open a support ticket.