Magicray,
Welcome to the forum.
Digit maps is a big subject, but I will keep this first post simple and let you read other posts or ask further questions later.
Most routing changes are best done in the Service Provider Digit Maps – In this case sp2, which is found in ITSP B > General > DigitMap.
The default is:
(1xxxxxxxxxx|<1>[2-9]xxxxxxxxx |011xx.|xx.)
Delete that and replace with:
(905xxxxxxx|416xxxxxxx)
That’s a very specific digit map, but if it suits your needs that’s fine.
Leave the Phone Port DigitMap and Phone Port OutboundCallRoute at default. You will notice that Msp2, that is digitMap for sp2, is in both of these and that’s how your routing changes will be picked up and used.
Also the other part of the question is should I be using OBiTALK expert to make changes or the local device. Which is better?
Both ways have good and bad points. Obihai recommend the portal expert pages. They work for me, but others go for directly accessing the Obi. You must use only one way not both. If you use expert pages you must uncheck both boxes to the right of the value you are changing, leave them unchecked, submit and wait a few minutes for the Obi to reboot.