[Sipp-users] SIP syntax error (Testing SBC)

[Dana Jaff]

Hi

 

I am using sipp to test an SBC (Session Border Controler (B2BUA)).  The scenario is UAC calls UAS through SBC.  The (Invite) sent from UAC to SBC is rejected with a 400 (Bad Request).  the 400 message contains (cause=SIP Syntax error).  When viewing the debug logs of the SBC, I see an INVITE parsing error on line 19.  Line 19 is the last line in the SDP 

 

a=rtpmap:0 PCMU/8000 

 

Does anyone have an idea why the SBC is genarating this parsing error.  The INVITE sent from UAC to SBC has the following format:

 

      INVITE sip:+15711110...@[remote_ip] SIP/2.0
      From: +15712220001 <sip:+15712220...@[local_ip]:[local_port]>;tag=[pid]SIPpTag00[call_number]
      To: <sip:+15711110...@[remote_ip]>
      Call-ID: [call_id]
      CSeq: 1 INVITE
      Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
      Max-Forwards: 70
      Contact: <sip:+15712220...@[local_ip]:[local_port];transport=udp>
      Content-Type: application/sdp
      Content-Length: [len]

 

      v=0
      o=user1 53655765 2353687637 IN IP[local_ip_type] [local_ip]
      s=-
      c=IN IP[media_ip_type] [media_ip]
      t=0 0
      m=audio [media_port] RTP/AVP 0
      a=rtpmap:0 PCMU/8000

 

Your feedback is appreciated

 

Thanks

Dana Jaff

Systems Engineer Lead
CSC

15000 Conference Center Drive, Chantilly VA 20151
Enforcement Security & Intelligence |  C : 571-338-6315 | O : 703-818-4135 | dj...@csc.com | www.csc.com

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