Yes they are hard coded on the home operator/carrier. Though this does not mean it will not route.
What country are you in?
The way I have seen them configured is they work from off-net if you prefix with correct codes.
Remember the foreign switch,smsc or ussd gateway is going to route the message if it has the correct prefix. The Routing (b number analysis) is looking up a prefix, to send it off.
It is up to your home operator to correctly handle this.
What country are you in?
The way I have seen them configured is they work from off-net if you prefix with correct codes.
Remember the foreign switch,smsc or ussd gateway is going to route the message if it has the correct prefix. The Routing (b number analysis) is looking up a prefix, to send it off.
It is up to your home operator to correctly handle this.
Source: 10+ years working with mobile operators