Phantom Internet calls

[koolandrew]

Is there any way to block phatom internet calls. The calls appear in the missed call list of the phone as number (any where from 3 to 9 digits)@ local ip address of phone. i have tried using the block call function in the phone book but there isnt enough entries and i have also tried using blockout call in the dial plan and that fuction has not stopped it all. Grandstream has a feature where you can block unknown callers and Yealink really needs to implement this feature as i may have to change these phones to Grandstream otherwise.

Here is what i used in blockout call as on this pbx, there are a total of six legitimate extensions 101, 102, 103, 201, 202, 203. It would be alot easier if it wouldnt accept calls that werent from the registered domain or something like that, which Grandstream has.

0xx
[3-9][1-9][4-9]
xxxx
xxxxx
xxxxxx
xxxxxxx
xxxxxxxx
xxxxxxxxx

Please advise ASAP as this customer is very upset.