When you dial out using VoIP/SIP, the call is currently formatted to originate from the area that your virtual number originates. This means that calls made outbound are formatted in the format of a UK local call.

An example of this is as follows-

UK (0044) 03333 444211

dials as 03333444211 or 00443333444211

South Africa (0027) – Mobile 0731234567 or +27731234567

dials as 0027731234567

You DO NOT use the + when calling out, instead use 00 then the country code, and also remove the first 0 if you have one.