[SIPForum-discussion] [Sip-implementors] Putting Record route in the responses

[hemanth kumar]

Hi,
   
  As sanjay had mentioned, Record-Route is used for subsequent requests which needs to traverse through the proxies. But the responses that are generated as part of the same transaction would ignore this header and retain it in the 4xx-5xx response as it does not hold any relevance in the current transaction (Initial transaction would use Via Header for the traversal).

  -Hemanth
Manpreet Singh <msingh at ibasis.net> wrote:
      Sanjay 
  Thanks for the response. I believe you were referring to Table 2 right? 
  The reason I got confused was because the UAC I was testing with was a cisco 5300 which was sending the ACK to the contact address in the 503 which was the UAS instead of the proxy where it sent the initial INVITE. It seems like a bug.
  Thanks 
Manpreet 
  -----Original Message----- 
From: Sanjay Sinha (sanjsinh) [mailto:sanjsinh at cisco.com] 
Sent: Wednesday, September 06, 2006 10:43 PM 
To: Manpreet Singh; discussion at sipforum.org; sip-implementors at cs.columbia.edu 
Subject: RE: [Sip-implementors] Putting Record route in the responses 
  Record-Route header is used to send subsequent requests after dialog is established. If Invite is rejected with an error response, there is no dialog and no need for RR header in error response. You can refer to Table 3 in RFC 3261

  -----Original Message----- 
From: sip-implementors-bounces at cs.columbia.edu 
[mailto:sip-implementors-bounces at cs.columbia.edu] On Behalf Of Manpreet Singh 
Sent: Wednesday, September 06, 2006 8:04 PM 
  To: discussion at sipforum.org; sip-implementors at cs.columbia.edu 
Subject: [Sip-implementors] Putting Record route in the responses 
Importance: High 
  Could someone point me to the part of the spec which talks about what all headers are to be inserted in all the response to an INVITE or any other request. I am bit lost trying to find the right explanation.
   
I am specifically looking for a case where a proxy inserts a Record-Route header in the outgoing invite and the UAS rejects the INVITE with some 5xx or a 4xx response. Now would the 4xx or 5xx response carry the R-R headers from UAS to the proxy and then back to UAC? I have generally seen the implementations where 100 doesnt carry and 18x carries it. 
   
thanks 
  
Manpreet 
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