DialstationSwitch
this is the piece which can trigger a call with src+dst+callerid. where src is a userid and refers to a phonenumber and dst is always a phonenumber.
it held a selfcontaining version of a routingtable of all dialstation users.
there for it need to support also update a pdn-entry and update the phonenumber for a user.
also we need to update the information if a userid is blocked or unblocked.
the goal of it is that in case the DialstationManager doesnt work. There is still a running freeswitch instance with the last state of the routing and the calls are actually can be routed even if charging and changing dont work.
resolve a pnd at the manager
GET /:callerid/pdns/:pdn should return the resolved number to call and user for bill
