Hello again, I just looked a bit deeper into my logs and came across something strange: I always at first get the message, that my zaptel input buffer is full and then the message, that my output buffer is empty. That seems strange, why are the problems only "one way"? Is it possible that there is a problem with the cabeling that results in such errors? Regards, Kai -- Kai Militzer WESTEND GmbH | Internet-Business-Provider Technik CISCO Systems Partner - Authorized Reseller L?tticher Stra?e 10 Tel 0241/701333-14 km@xxxxxxxxxxx D-52064 Aachen Fax 0241/911879