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Answer 1

This is easily done with dial peer statements . The dial peer in your originating router must route the calls to the terminating router first. That would look like :
dial-peer voice xxxxx voip ( the xxxxx is just a tag)
destination-pattern 45... (that would route any 5-digit calls beginning with 45)
session-target ipv4:xxx.xxx.xxx.xxx (ip address of the terminating router)
If digitones are to be dialed after the connection is established, use the statement:
dtmf-relay-h.245-alphanumeric
You could also use a statement to specify the codec to be used:
codec g711ulaw
You would need multiple voip dial peers if the calls were going to different routers based on the dialed digits. If all calls are sent to the same terminating router, use all wild cards in the dest-pattern statement.
At the terminating router configure pots dial peers:
dial-peer voice xxxxx pots
dest-pattern 45...
port x/x (whichever port the call is to be terminated on)
prefix 45 (this re-inserts matched digits which are stripped off by the pots dp)
Repeat for other ports which will receive calls.
Paul