[Users] BAD REQUEST

Hi. My problem is the next. When my sip server send the message INVITE to the phone, the phone always respond with 400 Bad Request, I think is something wrong in the message, in the UDP message the Checksum always is corrupted by the sip server, is it the problem? or is something else in the sip message? How I can correct this? this is the trace: User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 7191 (7191) Source port: 5060 (5060) Destination port: 7191 (7191) Length: 1057 Checksum: 0x879f [incorrect, should be 0xb0cd] Session Initiation Protocol Request-Line: INVITE sip:192.168.1.8:7191 SIP/2.0 Method: INVITE Resent Packet: True Suspected resend of frame: 9 Message Header Record-Route: <sip:192.168.1.20;lr=on;ftag=db79a2e2> Via: SIP/2.0/UDP 192.168.1.20;branch=z9hG4bKdfe7.2eeeaa64.0 Via: SIP/2.0/UDP 192.168.1.7:7191;branch=z9hG4bKN2IVzrueyM Max-Forwards: 69 Content-Type: application/sdp To: <sip:2109075@192.168.1.20> From: "4422109087" <sip:4422109087@192.168.1.20>;tag=db79a2e2 Call-ID: eea4130a-277bd7f8(a)192.168.1.7 CSeq: 1503273304 INVITE Allow: INVITE, ACK, CANCEL, MESSAGE, OPTIONS, BYE, UPDATE, REFER, SUBSCRIBE, NOTIFY, SERVICE User-Agent: PHONE-UserAgent Contact: "4422109087" <sip:4422109087@192.168.1.7:7191> P-hint: usrloc applied Message body Session Description Protocol Session Description Protocol Version (v): 0 Owner/Creator, Session Id (o): ntzum 717537891 1011557901 IN IP4 192.168.1.7 Session Name (s): - Connection Information (c): IN IP4 192.168.1.7 Bandwidth Information (b): CT:29 Time Description, active time (t): 0 0 Media Description, name and address (m): audio 49648 RTP/AVP 4 96 97 98 Media Attribute (a): sendrecv Media Attribute (a): rtpmap:4 G723/8000 Media Attribute (a): rtpmap:96 AMR/8000 Media Attribute (a): rtpmap:97 X-G723-7200/8000 Media Attribute (a): rtpmap:98 telephone-event/8000 Media Attribute (a): fmtp:98 0-15 Media Description, name and address (m): video 49650 RTP/AVP 99 100 34 Media Attribute (a): sendrecv Media Attribute (a): rtpmap:99 H264/90000 Media Attribute (a): fmtp:99 packetization-mode=1 Media Attribute (a): rtpmap:100 H263-1998/90000 Media Attribute (a): rtpmap:34 H263/90000 Regards! --------------------------------- Do You Yahoo!? La mejor conexión a Internet y 2GB extra a tu correo por $100 al mes. http://net.yahoo.com.mx