Bubblestar has indeed given the code for quite sometimes. My original codes can show callerid as 1xxxxxxxx@voice.goggle.com-mcxmnvmvnm.
Applying this modification, the callerid is now 9 digits US number
A further modification is to
Set(CALLERID(number)=${CALLERID(name):1:11})
This will show up 11 digits including US country code 1