Support Caller Picture from SIP-Server (Call-Info according to RFC 3261)
The Call-Info header field provides additional information about the caller or callee, depending on whether it is found in a request or response. The purpose of the URI is described by the "purpose" parameter. The "icon" parameter designates an image suitable as an iconic representation of the caller or callee. The "info" parameter describes the caller or callee in general, for example, through a web page. The "card" parameter provides a business card, for example, in vCard  or LDIF  formats. Additional tokens can be registered using IANA and the procedures in Section 27.