the possibility that only allow incoming calls from local numbers to a specific Talk number

Hello,

Thank you for your question. It is possible but please test this approach to make sure. 

1. You need to turn on omnichannel routing. 

2. You need to set up triggers to determine which group the call should go to.

1. Condition >,  channel is -> incoming phone call , Comment text contains -> “phone number in text form - example +1234” , where +1234 is the area code of the region.
2. Action > group name > desired group

Call flow will look something like:

1. With omnichannel routing, when call goes into the queue it creates a ticket >
2. triggers run on that ticket and have the ability to assign a group
3. Based on the group attached by the triggers, the call is routed to the specified group.

Thanks,

Sean