[SIPForum-discussion] Sequence of Via headers

[Abhishek Gupta]

Hi,

This is related to the sequence of Via headers. We all know that it is
copied from the request in the same order while forming the response and
sent to the topmost Via order. How valid is the below mentioned 180
response (having Via headers at different places) -

INVITE sip:1002 at 10.44.104.117:5060;transport=udp SIP/2.0
Record-Route: <sip:10.44.104.156;lr=on>
Via: SIP/2.0/UDP 10.44.104.156;branch=z9hG4bK7805.472b72f2.0
Via: SIP/2.0/UDP 10.44.104.119:32986
;branch=z9hG4bK-d8754z-fdbc5e3d0e2c5a3d-1---d8754z-;rport=32986
Max-Forwards: 16
Contact: <sip:1001 at 10.44.104.119:32986;transport=udp>
.
.
Content-Length: 216


SIP/2.0 180 Ringing
*Via: SIP/2.0/UDP 10.44.104.156;branch=z9hG4bK7805.472b72f2.0*
From: "1001"<sip:1001 at 10.44.104.156>;tag=87b60828
To: <sip:1002 at 10.44.104.156>;tag=331752176
Contact: <sip:1002 at 10.44.104.117:5060;transport=udp>
Call-ID: NTY3ZmQyZDgzM2JiMjQ5MjI3MDZjZDc5MDFiMjBjZmY
CSeq: 1 INVITE
Content-Length: 0
*Via: SIP/2.0/UDP 10.44.104.119:32986
;rport=32986;branch=z9hG4bK-d8754z-fdbc5e3d0e2c5a3d-1---d8754z-*
Record-Route: <sip:10.44.104.156;lr=on>
Allow: ACK, BYE, CANCEL, INVITE, MESSAGE, NOTIFY, OPTIONS, PRACK, REFER,
UPDATE


Regards,
Abhishek
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