[SR-Users] Number Portability Functionality

[Alex Balashov]

On 02/17/2010 05:45 AM, Asim Riaz wrote:

> what I understand that PDB server have all the routing information for
> all the numbers and SIP-Router receive that information and route the
> call accordingly but how PDB server receive the routing data? Do we need
> to load this routing data manually?

This is implementation-specific;  the fact that the module has been 
advertised as usable for number portability does not imply that this 
is the exclusive use, or that there are any insightful 
portability-specific features included.

The canonical PDB server is just a simple UDP listener that returns a 
16-bit integer value in network byte order, as explained in 
pdb_query().  A PDB server implementation is located in the source 
tarball in utils/pdbt, and contains some implementations for resolving 
carrier IDs based on DNIS

> What happen if the routing information for a number is changed, do we
> need to update manually?

On the Kamailio/SR side, it is queried dynamically every time 
pdb_query() is called.   On the PDB server side, it would appear that 
an update must happen manually with respect to the map file or other 
data source, yes.

Basically, you can build the server however you want as long as you 
follow the (very simple) protocol specification.  You don't have to 
use the built-in PDB server.

-- 
Alex Balashov - Principal
Evariste Systems LLC

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