According to RFC 3665 section 3.8 and RFC 3261 section 9,
there is only one via header in CANCEL message
(message F11, F13 at page 72 of RFC 3665).
But when I ran the similar scenario(through one proxy),
I got two via header in CANCEL message such as following:
CANCEL sip:[EMAIL PROTECTED];transport=udp SIP/2.0
Record-Route: <sip:192.0.50.50;lr=on;ftag=11380>
Via: SIP/2.0/UDP ss.under.test.com;branch=z9hG4bKd068.25909417.0
Via: SIP/2.0/UDP
node.under.test.com:5060;received=192.0.10.10;branch=z9hG4bKPUA4295483
Max-Forwards: 69
From: UA11 <sip:[EMAIL PROTECTED]>;tag=11380
To: <sip:[EMAIL PROTECTED]>
Call-ID: [EMAIL PROTECTED]
CSeq: 4 CANCEL
Content-Length: 0
P-hint: usrloc applied
How can I remove the 2nd via header?
Thank you
Fangyu Ling
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