On 5 November 2025, 9:00 a.m. to 6:00 p.m., maintenance work will be carried out on the VoIP system. This may result in temporary interruptions (up to 10 minutes) – subject to unforeseeable events – in the provision of the VoIP services:

• Telephony (VoIP softphone and hardphone)
• Voicemail (VoIP answering machine)
• Telephony in mobile working
• Telephony between ISDN- and VoIP-Phones