Has something changed about the format of numbers accepted. As, mentioned I've been using Zoiper for a while. Interestingly, recently I appear to be getting a lot of Proxy Authentication Required (407) in Zoiper. In fact I just tried (from home) a series of calls to my wife's number at work and it was hit or miss whether I got the 407 or whether the call went through with Zoiper. This was only with Zoiper and no Cloud Softphone running.