Google Voice now supports free calling to
iNum global telephone numbers (8835100xxxxxxxx).
To be able to dial iNum telephone numbers through Google Voice, simply add the following two rules to your Google Voice DigitMap:
Service Providers -> ITSP Profile x -> General -> DigitMap : (...|<8835100>xxxxxxxx|8835100xxxxxxxx|...)
where x is typically A for SP1 or B for SP2.
iNum global telephone numbers can then be called by dialing either the whole iNum number (8835100xxxxxxxx) or just the last eight digits.
The following iNum test numbers are available:
8835100
00000091 : Echo test
8835100
00000092 : DTMF test
8835100
00000093 : CallerID test