For Cisco SPA112 and Cisco SPA8000
From a default configuration, frist add account credentials to the unit, and then make these changes:
Dial plan for Line 1:
( [23456789]11 | *xxx. | [2-9]xx[2-9]xxxxxxS0 | 1[2-9]xx[2-9]xxxxxxS0 | 011xxxxxxx. | [#*x][*x][*x][*x][*x][*x][*x][*x][*x][*x][*x][*x]. )
Printed for easy cut and paste.
Additional configuration is required, please reference:
Additional configuration for SPA112 for VoIP G711 fax passthrough