So, I don't think this can be done, but it was given to me to find out so here goes.
Three sites, let's call them as follows
"Site A" DID range is "1112223333-4000"
"Site B" DID range is "4445556666-5000"
"Site C" DID range is "7778889999-6000"
All these sites have PSTN connections and they can all call each other fine. They are all connected via DMVPN so currently I have site codes set up that are as follows and using these site codes and the last 4 digits the call will go over the IP network and save the company come money, however this relies on the people to dial the site codes.
"Site A" #01
"Site B" #02
"Site C" #03
What I'm wondering is this. Is it possible to configure the gateways or the CUCM to see the a number in a range being dialed and automatically translate it to the site code + the last four digits so the call automatically goes over the IP network. There is one stipulation, the fax lines need to be excluded.
Any help would be great, if I haven't asked this correctly or if it's confusing at all please let me know.