I have a customer that recently moved to CUCM 6.1.3 and CER 2.0.3. The system is working as designed: 911 calls are going to the PSAP, however there are a lot more accidental 911 calls than they used to have when they were on Avaya. '9' remains their access code so it is no mystery what is happening. Users are dialing 911 by mistake and getting routed to the PSAP. One note: both 911 and 9911 are configured to go to the PSAP (9911 is translated to 911, which in turn matches the CTI RP and goes to CER). I am trying to confirm what was mitigated this issue on the Avaya but so far have not gotten any good information. I know changing the access code from 9 to another digit would go a long way to resolving this but that is not an option. Adding another RP that would compete with the 911 CTI RP would allow the T302 timer to kick in which would give more time for the caller to hang up before the call completes but I don't like that as a solution since it delays emergency calls.
Again, I know that this is working as designed. I am just trying to confirm if there are any other solutions that have been posed for this issue.