genau das war es !!!!
hier der Sip-Trace
Remote-Party-ID: "Anonymous" <sip:
[email protected]>;privacy=off;screen=no
Date: Mon, 29 Sep 2008 12:24:20 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY^M
Supported: replaces
P-Asserted-Identity: <49xxxxx>...