The Nokia E75 has a SIP-based Voice over IP (VoIP) client built-in, meaning that the handset can make and receive calls over the Internet provided that the SIP PBX can be configured to support the device.

In this post I shall be using SIPtrix, the Asterisk-based Linux PBX server. There are a number of pre-requisites that need to be satisfied on the server:

The SIPtrix server must have a ‘real world’, ‘routable’, ‘public’, or ‘Internet-facing’ IP address that is available from the Internet. Without this, no remote connectivity will be possible.

Before the Nokia E series handsets can be used as remote extensions, there are a number of pre-requisites that need to be satisfied on the server:

The SIPtrix server must have a ‘real world’, ‘routable’, ‘public’, or ‘Internet-facing’ IP address that is available from the Internet. Without this, no remote connectivity will be possible.

The Unified Messaging server role of Exchange 2007 offers the ability of integrating your IP PBX with Exchange, so that voicemail messages are delivered directly to the user’s Exchange Inbox.

The BlackBerry Mobile Voice System (MVS) is a server-based product designed to sit between your existing BES and your IP-capable PBX, effectively turning your BlackBerry handheld device into a remote extension of the corporate telephone system: if you are out of the office, or just not at your desk, incoming calls to your desk DDI can be forwarded automatically to your mobile; and similarly any calls you make from your handheld can be routed out through the remote PBX so that calls appear as having originated from your office (and can be billed accordingly using the PBX’s least-cost routing ca