Mr X,
In the link you referred to in your response there is a document SkypeTrunk.pdf . When I click on the link for this document, I get a response not authorised to access this resource. Is there something in this that I migth find helpful? If so can you provide me with a valid link.
snom ONE,
The first link you posted refers to a Yealink product page. Is this what you intended?
Cheers, Loz.