# How do I change my contract details? #### **Change of contracting party** You have the option of transferring an existing sipgate account to new contracting parties. The existing terms and conditions remain in place. The new contracting parties can then terminate or amend this contract individually in accordance with our [Terms and Conditions](https://www.sipgate.de/agb-sipgate) . The phone numbers remain assigned to the account and are taken over in accordance with the **declaration of transfer** . Partial or complete porting by the transferring contracting parties is not possible. Nor can phone numbers be taken over on their own; they are firmly linked to the associated contract. Phone numbers from area codes that are not covered by the locations of the new contracting parties will be detached from the customer account on the date the access is taken over and, after the period imposed by the Federal Network Agency, released again. For a **Change of contracting party** please fill out the [form provided here](https://static.sipgate.com/static/downloads/docs/Vertragsdatenaenderung.pdf) and send it together with the requested documents/proof by email to or by fax to 0211-58005400. Alternatively, you can also send us the form by post to sipgate GmbH, Customer Support, Gladbacher Str. 74, 40219 Düsseldorf. As soon as we have received and processed your request, we will inform you by email. We recommend that you log in to your sipgate account and change your user data yourself. #### **Verify location address** To verify the address of the new locations, the new contracting party attaches the relevant current **documents** providing information about the authorization (e.g. **business registration, commercial register excerpt, electricity, water or gas bill**). Rental agreements are accepted only for a **change of location by private customers** . #### **Change users** The users of the transferring account holder are not deleted automatically by us. The transferring account holder can delete all users before the account is transferred. Only one admin access must remain. The new account holders can then create their users. In this step, we also recommend that **all passwords be changed**. Alternatively, the new account holders can delete the users that are no longer needed and create new ones, if that is desired at all. #### **Change billing address** Select in the **account management** left **Account** and then **Management** out. Then switch to the menu item **Invoices** and change the billing address there as desired. Afterwards, you can in the section **Invoices,** have each invoice created so far from the last 12 months reissued with the new billing address. To do this, click the circular icon behind the respective invoice. You will then receive a cancellation invoice as well as a newly issued invoice with the updated billing details, which you can download. ![Screenshot from 2025-06-30 10-03-38.png](/files/5921cfd54b6477bcad4fef481ab4d33ceabb043b) #### **Change locations** Go to the menu item [**Locations**](https://app.sipgate.com/team/settings/location). There you can use the button **Add** to create a new location or use the three dots next to your current location to request a move to a new location. You can also edit an existing directory listing here. It is advisable to first delete an existing directory listing completely and only carry out the new entry after one week, due to the data comparison with the relevant parties. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://help.sipgate.de/cloud-telefonanlage/en/account-management/vertrage-rechnungen-und-preise/wie-aendere-ich-meine-vertragsdaten.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.