Users have a 4 digit internal extension. From a phone, calls to Skype are routed with a pattern of *50XXXX. On Skype, we have a normalization rule that translate *50XXXX to +999XXXX.
Skype users are configured with a Line uri of Tel:+999XXXX. When Skype users call a phone on CUCM, there is a calling transformation pattern that change +999XXXX to *50XXXX, this way when a phone call is missed, the extension recorded in missing calls can route back to Skype.
Problem : when a phone calls a skype user, when trying to transfer the call to another skype user, the call is placed on hold and we get an error "unable to make the transfer".
The logs show a 404 not found error, but the refer call seems to be correct.
Any advice on how to obtain more info on this error would be appreciated