Make sure that you do not rewrite the IP address in SDP twice, that means if you call force_rtp_proxy then do not call fix_nated_sdp and vice versa. Both of them try to rewrite the same IP address which is incorrect.

The errors below mean that you try to call nathelper functions on a function with empty message body (probably ACK, BYE, or CANCEL).

Jan.

On 28-08 17:42, Jiang zhou wrote:

With ser-0.8.14_linux_i386.tar.gz verion and cfg file as bellow. The callee recieve error messages:

RECEIVE TIME: 16626717 RECEIVE << 210.22.131.228:5060 INVITE sip:7776@210.22.131.226:5060 SIP/2.0 Record-Route: sip:7776@210.22.131.228;ftag=3498;lr=on Via: SIP/2.0/UDP 210.22.131.228;branch=z9hG4bK262e.c0776712.0 Via: SIP/2.0/UDP 192.168.0.120:5060;rport=15060;received=210.22.131.226;branch=z9hG4bK16045 From: sip:8000@210.22.131.228;tag=3498 To: sip:7776@210.22.131.228 Call-ID: 16927@192.168.0.120 CSeq: 20 INVITE Contact: sip:8000@210.22.131.226:15060 Max-Forwards: 4 User-Agent: eXosip/0.1 Subject: test subject Expires: 120 Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, REFER, SUBSCRIBE, NOTIFY, MESSAGE Content-Type: application/sdp Content-Length: 225 Alex-hint: NAThelper Alex-hint: SDP rewritten P-hint: usrloc applied NAT: ...

v=0 o=userX 20000001 20000001 IN IP4 192.168.0.120 s=A call c=IN IP4 210.22.131.226210.22.131.228

t=4 3604
m=audio 35058 RTP/AVP 8
a=rtpmap:8 pcma/8000
a=direction:active
a=oldmediaip:192.168.0.120
a=nortpproxy:yes

log message show the follow error:
Aug 28 17:34:33 sipod-sh /usr/local/sbin/ser[10986]: ERROR: extract_body: message body has lenght zero 
Aug 28 17:34:33 sipod-sh /usr/local/sbin/ser[10986]: ERROR: fix_nated_sdp: cannot extract body from msg! 
Aug 28 17:34:33 sipod-sh /usr/local/sbin/ser[10986]: ERROR: extract_body: message body has lenght zero 
Aug 28 17:34:33 sipod-sh /usr/local/sbin/ser[10986]: ERROR: force_rtp_proxy2: can't extract body from the message 
Aug 28 17:34:33 sipod-sh /usr/local/sbin/ser[10987]: ERROR: extract_body: message body has lenght zero 
Aug 28 17:34:33 sipod-sh /usr/local/sbin/ser[10987]: ERROR: fix_nated_sdp: cannot extract body from msg! 
Aug 28 17:34:33 sipod-sh /usr/local/sbin/ser[10987]: ERROR: extract_body: message body has lenght zero 
Aug 28 17:34:33 sipod-sh /usr/local/sbin/ser[10987]: ERROR: force_rtp_proxy2: can't extract body from the message 
Aug 28 17:34:42 sipod-sh /usr/local/sbin/ser[10990]: ERROR: extract_body: message body has lenght zero 
Aug 28 17:34:42 sipod-sh /usr/local/sbin/ser[10990]: ERROR: fix_nated_sdp: cannot extract body from msg! 
Aug 28 17:34:42 sipod-sh /usr/local/sbin/ser[10990]: ERROR: extract_body: message body has lenght zero 
Aug 28 17:34:42 sipod-sh /usr/local/sbin/ser[10990]: ERROR: force_rtp_proxy2: can't extract body from the message 









  ----- Original Message ----- 
  From: Jiang zhou 
  To: serusers@lists.iptel.org 
  Sent: Saturday, August 28, 2004 4:56 PM
  Subject: [Serusers] rtpproxy problem


  Does someone run ser-8.14 version with nathelper and rtpproxy successful?
  Or does someone can run the latest cvs verion ser and rtpproxy successful?

  In cvs version I have gotten the follow errors:
  ug 28 16:32:00 sipod-sh /usr/local/sbin/ser[10654]: WARNING: no fifo_db_url given - fifo DB commands disabled! 
  Aug 28 16:32:05 sipod-sh /usr/local/sbin/ser[10659]: NOTICE:maxfwd:process_maxfwd_header: value 70 decreased to 16 
  Aug 28 16:32:16 sipod-sh /usr/local/sbin/ser[10660]: NOTICE:maxfwd:process_maxfwd_header: value 70 decreased to 16 
  Aug 28 16:32:19 sipod-sh /usr/local/sbin/ser[10662]: NOTICE:maxfwd:process_maxfwd_header: value 70 decreased to 16 
  Aug 28 16:32:19 sipod-sh /usr/local/sbin/ser[10662]: ERROR: alter_mediaip: you can't rewrite the same SDP twice, check your config! 
  Aug 28 16:32:19 sipod-sh /usr/local/sbin/ser[10662]: ERROR: fix_nated_sdp: can't alter media IP
  Aug 28 16:32:19 sipod-sh /usr/local/sbin/ser[10662]: ERROR: alter_mediaip: you can't rewrite the same SDP twice, check your config! 
  Aug 28 16:32:20 sipod-sh /usr/local/sbin/ser[10660]: WARNING: run_actions: null action list (rec_level=1) 
  Aug 28 16:32:20 sipod-sh /usr/local/sbin/ser[10659]: WARNING: run_actions: null action list (rec_level=1) 
  Aug 28 16:32:20 sipod-sh /usr/local/sbin/ser[10662]: WARNING: run_actions: null action list (rec_level=1) 
  Aug 28 16:32:25 sipod-sh /usr/local/sbin/ser[10659]: WARNING: run_actions: null action list (rec_level=1) 
  Aug 28 16:32:25 sipod-sh /usr/local/sbin/ser[10660]: NOTICE:maxfwd:process_maxfwd_header: value 70 decreased to 16 
  Aug 28 16:32:26 sipod-sh /usr/local/sbin/ser[10661]: WARNING: run_actions: null action list (rec_level=1) 
  Aug 28 16:34:39 sipod-sh /usr/local/sbin/ser[10660]: NOTICE:maxfwd:process_maxfwd_header: value 70 decreased to 16 

  In 8.14 version I have gotten follow errors:

  ug 28 16:53:41 sipod-sh /usr/local/sbin/ser[10779]: WARNING: run_actions: null action list (rec_level=1) 
  Aug 28 16:53:41 sipod-sh /usr/local/sbin/ser[10776]: WARNING: run_actions: null action list (rec_level=1) 
  Aug 28 16:53:41 sipod-sh /usr/local/sbin/ser[10777]: WARNING: run_actions: null action list (rec_level=1) 
  Aug 28 16:53:44 sipod-sh /usr/local/sbin/ser[10776]: WARNING: run_actions: null action list (rec_level=1) 
  Aug 28 16:53:46 sipod-sh /usr/local/sbin/ser[10777]: WARNING: run_actions: null action list (rec_level=1)

  Can some give me a successful configure file and verion infromation?


  Thank you.



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