error Aastra 6730i

Apr 10, 2014 at 8:30 AM

help me

Time: 10:19:27.50
Type: SIPIncoming
Description: 400 Bad Request
From: 192.168.0.159:5060

To: 192.168.0.240

SIP/2.0 400 Bad Request
Via: SIP/2.0/UDP 192.168.0.240:5060;rport;branch=46163E4ADB2E4EA097057D829404994A
From: "Flavio Zocaro - Programmi Aziendali" sip:08611855725@192.168.0.240:5060;tag=2CE1E683EB4641AA9921F2C46738DAB9
To: sip:420@192.168.0.159:5060;tag=3774303363
Call-ID: 7A6AF7F0167D4A0886483B85CA40EFED@192.168.0.240 CSeq: 4880 ACK
Server: Aastra 6730i/3.2.2.2044
Content-Type: text/plain
Content-Length: 21

Invalid request line.