INVITE sip:41215500309@192.168.1.15 SIP/2.0 Via: SIP/2.0/UDP 192.168.1.9;branch=z9hG4bKfae8cb69f547b8cb Max-Forwards: 70 To: From: ;tag=102 User-Agent: UDP Packet Sender Call-ID: 070403-200101@192.168.1.9 CSeq: 5000 INVITE Contact: Content-Type: application/sdp Content-Length: 0