---
UID: NF:faxcomex.IFaxIncomingMessage.get_CallerId
title: IFaxIncomingMessage::get_CallerId (faxcomex.h)
description: The CallerId property is a null-terminated string that identifies the calling device associated with the inbound fax message.
old-location: fax\_mfax_faxincomingmessage_cpp_mfax_faxincomingmessage_callerid_cpp.htm
tech.root: Fax
ms.assetid: VS|fax|~\fax\faxinta_n_1bfo.htm
ms.date: 12/05/2018
ms.keywords: CallerId property [Fax Service], CallerId property [Fax Service],IFaxIncomingMessage interface, IFaxIncomingMessage interface [Fax Service],CallerId property, IFaxIncomingMessage.CallerId, IFaxIncomingMessage.get_CallerId, IFaxIncomingMessage::CallerId, IFaxIncomingMessage::get_CallerId, _mfax_faxincomingmessage.callerid, fax._mfax_faxincomingmessage_callerid, fax._mfax_faxincomingmessage_cpp_mfax_faxincomingmessage_callerid_cpp, faxcomex/IFaxIncomingMessage::CallerId, faxcomex/IFaxIncomingMessage::get_CallerId, get_CallerId
f1_keywords:
- faxcomex/IFaxIncomingMessage.CallerId
dev_langs:
- c++
req.header: faxcomex.h
req.include-header: 
req.target-type: Windows
req.target-min-winverclnt: Windows XP [desktop apps only]
req.target-min-winversvr: Windows Server 2003 [desktop apps only]
req.kmdf-ver: 
req.umdf-ver: 
req.ddi-compliance: 
req.unicode-ansi: 
req.idl: 
req.max-support: 
req.namespace: 
req.assembly: 
req.type-library: 
req.lib: 
req.dll: Fxscomex.dll
req.irql: 
topic_type:
- APIRef
- kbSyntax
api_type:
- COM
api_location:
- Fxscomex.dll
api_name:
- IFaxIncomingMessage.CallerId
- IFaxIncomingMessage.get_CallerId
targetos: Windows
req.typenames: 
req.redist: 
ms.custom: 19H1
---

# IFaxIncomingMessage::get_CallerId


## -description


The <b>CallerId</b> property is a null-terminated string that identifies the calling device associated with the inbound fax message.

This property is read-only.


## -parameters


## -see-also




<a href="https://docs.microsoft.com/previous-versions/windows/desktop/fax/-mfax-faxincomingmessage">FaxIncomingMessage</a>



<a href="https://docs.microsoft.com/previous-versions/windows/desktop/api/faxcomex/nn-faxcomex-ifaxincomingmessage">IFaxIncomingMessage</a>



<a href="https://docs.microsoft.com/previous-versions/windows/desktop/fax/-mfax-managing-the-incoming-archive">Visual Basic Example</a>
 

 

