Development of a IP Centrex (internet telephon system) solution medium-sized provider.

Linux, Asterisk, OperSER, MySQL

• Configuration and customisation of the OpenSource components.
• Development of services for configuration and administration of the system, e.g. control of Asterisk administration interfaces.

• Configuration of OpenSER, Routing to Asterisk and back.
• Receiving, treatment and storage (MySQL) of Asterisk events.
• Configuration tools

Development of a large VoIP solution based on OpenSource software

Linux, PostgreSQL (Cluster), OpenLDAP (HA with DRBD), FreeRadius

• Collaboration in a large development team, that included the OpenSource software OpenSER as base component in a scalable solution.
• Connection of the supporting systems (PostgreSQL, OpenLDAP, freeradius) and customisation/development of the required interfaces.
• Integration of high availability for the whole system (DRBD, PostgreSQL Replication, automatic failover with heartbeat)

• Software development and Customisation (C) in OpenSER (among others LDAP module, adaption of the Radius interface)
• Implementation of the complex routing logic within OpenSER (conditional and unconditional forward, authentification, loop detection)
• PostgreSQL in a PGCluster (several patches for PGCluster, configuration)
• automatic configuration of the operating system (Debian Linux) and the components.

Development of a large unified messaging system for a provider.

Linux, GFS (connected by Fiberchannel), OpenLDAP

• Collaboration in a large development team, used the OpenSource software qmail as central component for the system and adapted it to the customers special wishes.
• Configuration and customisation of the supporting systems (OpenLDAP, IMAP and POP).
• High availability by GFS and heartbeat.
• Automatic configuration of the operating system (RedHat Linux) and the components.

• Customisations in qmail and the POP/IMAP server (C).
• Scripting of tools for configurations and monitoring.
• Configuration of heartbeat.