OpenSIPS is a very fast and flexible SIP (RFC3261) server. Written entirely in C, OpenSIPS can handle thousands calls per second even on low-budget hardware.

This module is a lightweight wrapper for the MaxMind GeoIP API. It adds IP address-to-location lookup capability to OpenSIPS scripts. Lookups are executed against the freely-available GeoLite City database; and the non-free GeoIP City database is drop-in compatible Lookups are executed against the freely-available GeoLite City database; and the non-free GeoIP City database is drop-in compatible