[Serusers] Enum as location-database

[Soren (Home)]

Hi again,

I am not sure what you mean by ISDN PBX - its a PBX located on a
dialup-ISDN or?

Just to understand your scenario:

You have: INVITE 0123451000 at my.domain

Which you can lookup as: 012345 at my.domain

Which returns a contact like: 012345 at 1.2.3.4

Where you need to append the extention: 0123451000 at 1.2.3.4

Is this correct?

I think ENUM is maybe an too advanced scheme to do this thing :-). Mostly
because you also need to update the location of 012345 at 1.2.3.4 when it
registers and because registers in my system happens much more frequently
than invites. I would maybe do something like:

if (uri =~ "sip:012345[0-9]+ at .*") {

   setuser("012345");
   if (!lookup("location")) {
      # isdn pbx offline, do something
      break;
   };

   # rewrite using old uri and hostpart from new_uri
   exec_dst('
SIP_RHOST=${SIP_RURI/sip:*@/}
echo "sip:$SIP_OUSER@$SIP_RHOST"
'):

};

You can rewrite the script to something blazing fast in C or the like ;-)


Cheers,


> Greg Fausak wrote:
>> We use enum for internal location like routing.
>> For example, we maintain a simple tab separated file:
>>
>> ENUM    4695461265      sip+E2U addaline.com
>> ENUM    4695461266      sip+E2U addaline.com
>
> Ok, but this is also rather static and only changes if a new number is
> subscribed to the system, isn't it?
>
> What I'm looking for is a solution to maintain a very dynamic location
> database in enum.
> I've a few thousand subscribers registering from IP addresses that are
> assigned by DHCP, so they can and do change from one register to the next.
>
> So I want to perform something like:
>
> if(www_authorize("my.domain", "subscriber")) {
>    save("location"); # just for backup
>    exec_msg('/foo/nsupdate_wrapper register');
> }
> else { ... }
>
> nsupdate_wrapper calls the nsupdate-utility and dynamically updates the
> DNS entry.
>
> The only problem I can see is how to remove expired entries from the
> enum tree.
>
> Does that make sense?
>
> Andy
>


-- 
Soren Davidsen,
Univ: AUE department of computer science, room H302, +45-20676081
Home: http://tanesha.net/, +45-36947805 or +1-3602266324
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