[Serusers] Enum as location-database

Hi all, Just thought about adding a private enum-db to my system and use it as kind of location database in addition to the location-table in mysql. This would have the advantage that I could handle number suffices for a PBX behind an ISDN telephone adapter rather easily. Example: such an UAC is registered as 012345(a)1.2.3.4. Someone now calls 0123451000(a)my.domain, and enum resolves this to 0123451000(a)1.2.3.4 by applying a proper regexp. Now the problem is: how do I keep the enum database up to date? The enum module doesn't provide anything for that. The easy part is performing a DNS-update when someone successfully registers, by calling an external script. But how do you delete the entries from DNS when they for example expire? Or is enum not supposed to be used for that anyway? Cheers, Andy