You can send calls with a note or as an attachment to a document. The recipient can then call you back by calling the document or the attachment.
Procedure

Alternatively, you can send the object directly by specifying the type OBJ and selecting the object SAPphone: Telephone call.
A list of object types available for the attachment is displayed.
Example
An employee cannot be reached by telephone at the moment. You can send a message to the employee, informing them that you are trying to contact them and append an executable call to your telephone number to the message. When the recipient executes the attachment, the Initiate call dialog box containing the specified number is displayed.

SAPphone uses this function when a user is to be informed about unanswered calls. If the