Put the numbers you want in a User Defined Digit Map. Separate the numbers with the pipe character. Check the exact format that CID is sent by the ITSP (eg leading 1 or not) by looking at Call History on the OBi.
Give the map a name eg whi
Example map: (2123456789|5559876543|0111986821389)
Then make the X_InboundCallRoute of the relevant Voice Service be
{(Mwhi):ph},{()}