On June 14, 2005, Voice System announced that they had created OpenSER. This is the reason stated on the OpenSER website (http://www.openser.org/): The reason for this new venture is the lack of progressing and contributions to the SER project from the other SER team members as well as the reticience to new contributions from project's community members.

The Voice System SER developers felt that iptelorg.com, who made the final decisions on releases and code, had failed to take in new code contributions and also been too slow in releasing new versions of SER. The announcement made a stir on the serusers mailing list. The general feeling was that new features are good, it had been difficult to get code into the code versioning system (CVS) due to slow response from developers who had to accept the code, but most people felt that it would be easier for the community if both the stability and quality assurance found in SER could be combined in the same project with the OpenSER goals.