IP exchange

IPX is not intended to replace or compete with the Internet but it does offer an alternative option for service providers.

The commercial relationships are underpinned with service level agreements which guarantee performance, quality and security.

Even though the GRX environment is not entirely suitable as a common IP network for interconnection and roaming, it offers a good starting point for the development of IPX.

A typical end-to-end path of traffic in a fixed to mobile interconnection scenario is illustrated below:

Multilateral on the other hand means that the IPX provider to some extent takes care of both handling the contract and connectivity set-up on behalf of the operators.

From 2004 onwards, GSMA SIP Trials tested IP-based NNI with numerous IMS based services.

IPX Pre-commercial Implementation[2] trials have been ongoing since April 2007 focusing especially on packet switched voice service.