---
type: source
title: "Private Telephony Calls at Universität Greifswald"
tags: [telephony, policy, billing]
related: [tk-system, private-telephony-usage]
created: 2026-06-30
updated: 2026-06-30
sources: ["output/rz_uni_greifswald_de_dienste_technische_infrastruktur_telefonie_private_telefong.md"]
---

# Private Telephony Calls at Universität Greifswald

This source documents the regulations and technical procedures for making private telephone calls using the university's telecommunications infrastructure.

## Key Provisions
- **Permission**: Staff are permitted to make private calls from any extension via the TK-System, provided that business operations are not impaired. This is based on a service agreement dated 19.12.2013.
- **Prerequisites**: Users must have an activated [[zentraler-nutzeraccount]] and use their university email account.
- **Authentication**: Private calls require the use of a personal phone number PIN, which must be kept secret and changed immediately if compromised.

## Technical Execution
To initiate a private call from one's own extension, the user must prefix the destination number with the code **850**. The system will then prompt for the user's PIN for authentication.

## Billing and Administration
- **Costs**: Private calls are billed to the user.
- **Cycle**: Billing occurs quarterly.
- **Minimum Threshold**: Charges under 5.00 EUR per quarter are waived.
- **Delivery**: Invoices are sent exclusively via email.
- **Objections**: Any objections to the billing must be submitted to the [[universitatsrechenzentrum-urz]] within 8 weeks of receipt.

Support for telephony issues is handled via the [[groupware]] ticket system or the URZ hotline (ext. 1420).