# How do I set the caller ID in sipgate trunking? If you want to transmit your caller ID number, you must configure your system so that the desired phone number is passed in the **E164 format** (international format, without leading zeros or plus signs) as **P-Preferred-Identity** header of the INVITE: ``` P-Preferred-Identity: ``` If your system does not support this, the phone number can alternatively be provided in quotation marks as **display name of the FROM header** in the same **E.164 format** is passed: ``` FROM: "49211123456789" ``` Examples of incorrect formats that prevent the desired caller ID from being transmitted are: * leading plus: +49211123456789 * missing country code: 211123456789 * 00 in the country code: 0049211123456789 * leading zero in the area code: 490211123456789 * spaces: 49 211 123456789 ## Suppress caller ID If you want to completely suppress the caller ID, enter in the INVITE header **privacy:id** as follows: ``` FROM: "49211123456789" Privacy: id ``` ## Caller ID display for call forwarding You can also signal that a call has been forwarded. Please use the **DIVERSION** header and transmit the number again in the **E.164 format**: ``` Diversion: <49211123456789@sipconnect.sipgate.de> ``` --- # 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/trunking/en/wie-setze-ich-bei-sipgate-trunking-die-absenderrufnummer.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.