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f: "itsp" <sip:17772830314@itsp.com>;tag=45682
t: "itsp" <sip:17772830314@itsp.com>
i: niyrncl8@pbx
CSeq: 8042 REGISTER
Proxy-Authenticate: Digest realm="itsp.com",
domain="sip:itsp.com", nonce="ab45353d389d01ba208623
2c09417752", opaque="", stale=TRUE, algorithm=MD5
l: 0
[7] 2010/04/14 16:05:17:
REGISTER sip:itsp.com SIP/2.0
Via: SIP/2.0/UDP 75.150.83.2:5060;branch=z9hG4bK-
a071e61e35d725f2c9a17c9bf2edb7f7;rport
From: "itsp" <sip:17772830314@itsp.com>;tag=45682
To: "itsp" <sip:17772830314@itsp.com>
Call-ID: niyrncl8@pbx
CSeq: 8043 REGISTER
Max-Forwards: 70
Contact: <sip:17772830314@75.150.83.2:5060;transport=udp;line
=19ca14e7>;+sip.instance="<urn:uuid:7e96105b-8c8b-440e-a0aa-
07add8c80727>"
User-Agent: snom-PBX/4.0.1.3453
Supported: outbound
Proxy-Authorization: Digest realm="itsp.com",nonce="ab45
353d389d01ba2086232c09417752",response="664617e317a5c34
448f276db3932be2f",username="17772830314",uri="sip:itsp.
com",algorithm=MD5
Expires: 3600
Content-Length: 0
SIP/2.0 200 Ok
CANCEL Request
The CANCEL request cancels pending transactions and generates an error response
to the pending request. CANCEL has no effect on requests that have already received
a final response (e.g., an ACK). Therefore, the CANCEL method is often associated
with methods that require lengthy response times, such as the INVITE. A UAS that
receives a CANCEL request for an INVITE but hasn't yet sent a final response would
Appendix B: SIP Overview
SIP Tx udp:204.11.192.31:5080:
515
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