13 Nov
2006
13 Nov
'06
12:21 p.m.
Hello,
On 11/08/06 01:28, Mark Kent wrote:
Observant readers will recognize from the following
that this question
is related to earlier posts from me... that is: there is something
fundamental that I just don't get.
If someone is eager to answer all my questions, then
please search ahead for the question marks (?).
Also, what is the bigger picture that I am missing?
Please use as many words as necessary to explain.
Thanks,
-mark
The players:
CUSTOMER-IP: the UserAgent
OPENSER-IP: my openser box
OPENSER.FQDN: the fully qualified domain name of my openser box
PSTNGW-IP: the PSTN gateway
My openser box gets this CANCEL:
U 2006/11/06 18:40:10.689785 CUSTOMER-IP:5060 -> OPENSER-IP:5060
CANCEL sip:011445551212@OPENSER.FQDN:5060 SIP/2.0
From: <sip:CUST-PHONE-NUMBER@CUSTOMER-IP:5060;transport=UDP>;tag=TAG
To: <sip:011445551212@OPENSER.FQDN:5060;transport=UDP>
Call-ID: CALLID@CUSTOMER-IP
CSeq: 2 CANCEL
Via: SIP/2.0/UDP CUSTOMER-IP:5060;branch=BRANCH
Max-Forwards: 70
Supported: 100rel,replaces
Content-Length: 0
It ends up in my standard stateful relay handler where I
t_relay() it (should I?) and this gets generated:
#
U 2006/11/06 18:40:10.691301 OPENSER-IP:5060 -> PSTNGW-IP:5060
CANCEL sip:445551212@PSTNGW-IP;user=phone SIP/2.0
Record-Route: <sip:011445551212@OPENSER-IP;lr=on;ftag=TAG>
From: <sip:CUST-PHONE-NUMBER@CUSTOMER-IP:5060;transport=UDP>;tag=TAG
To: <sip:011445551212@OPENSER.FQDN:5060;transport=UDP>
Call-ID: CALLID@CUSTOMER-IP
CSeq: 2 CANCEL
Via: SIP/2.0/UDP OPENSER-IP;branch=BRANCH2.0
Via: SIP/2.0/UDP CUSTOMER-IP:5060;branch=BRANCH
Max-Forwards: 69
Supported: 100rel,replaces
Content-Length: 0
and this also happens:
#
U 2006/11/06 18:40:10.691342 OPENSER-IP:5060 -> CUSTOMER-IP:5060
SIP/2.0 200 canceling
From: <sip:CUST-PHONE-NUMBER@CUSTOMER-IP:5060;transport=UDP>;tag=TAG
To: <sip:011445551212@OPENSER.FQDN:5060;transport=UDP>;tag=TAG2
Call-ID: CALLID@CUSTOMER-IP
CSeq: 2 CANCEL
Via: SIP/2.0/UDP CUSTOMER-IP:5060;branch=BRANCH
Content-Length: 0
How was that last packet generated, where was it done?
it was done inside TM module. A stateful proxyshould send immediately
back a reply to CANCEL.
It's not in my openser.cfg, should I have sent
back just such
a message? If so, would this automagically sent message still
have been sent?
Next I get these two packets:
#
U 2006/11/06 18:40:10.761582 PSTNGW-IP:5060 -> OPENSER-IP:5060
SIP/2.0 200 OK
Call-ID: CALLID@CUSTOMER-IP
From: <sip:CUST-PHONE-NUMBER@CUSTOMER-IP:5060;transport=UDP>;tag=TAG
To: <sip:011445551212@OPENSER.FQDN:5060;transport=UDP>
Content-Length: 0
CSeq: 2 CANCEL
Via: SIP/2.0/UDP OPENSER-IP;branch=BRANCH2.0,SIP/2.0/UDP
CUSTOMER-IP:5060;branch=BRANCH
Contact: sip:445551212@PSTNGW-IP:5060;user=phone
Record-Route: <sip:011445551212@OPENSER-IP;lr=on;ftag=TAG>
#
U 2006/11/06 18:40:10.761616 PSTNGW-IP:5060 -> OPENSER-IP:5060
SIP/2.0 487 Request Terminated
Call-ID: CALLID@CUSTOMER-IP
From: <sip:CUST-PHONE-NUMBER@CUSTOMER-IP:5060;transport=UDP>;tag=TAG
To: <sip:011445551212@OPENSER.FQDN:5060;transport=UDP>;tag=20505
Content-Length: 0
CSeq: 2 INVITE
Via: SIP/2.0/UDP OPENSER-IP;branch=BRANCH2.0,SIP/2.0/UDP
CUSTOMER-IP:5060;branch=BRANCH
and my openser box replies with :
#
U 2006/11/06 18:40:10.762238 OPENSER-IP:5060 -> PSTNGW-IP:5060
ACK sip:445551212@PSTNGW-IP;user=phone SIP/2.0
Via: SIP/2.0/UDP OPENSER-IP;branch=BRANCH2.0
From: <sip:CUST-PHONE-NUMBER@CUSTOMER-IP:5060;transport=UDP>;tag=TAG
Call-ID: CALLID@CUSTOMER-IP
To: <sip:011445551212@OPENSER.FQDN:5060;transport=UDP>;tag=20505
CSeq: 2 ACK
Content-Length: 0
and sends on this to the UAC:
#
U 2006/11/06 18:40:10.762377 OPENSER-IP:5060 -> CUSTOMER-IP:5060
SIP/2.0 487 Request Terminated
Call-ID: CALLID@CUSTOMER-IP
From: <sip:CUST-PHONE-NUMBER@CUSTOMER-IP:5060;transport=UDP>;tag=TAG
To: <sip:011445551212@OPENSER.FQDN:5060;transport=UDP>;tag=20505
Content-Length: 0
CSeq: 2 INVITE
Via: SIP/2.0/UDP CUSTOMER-IP:5060;branch=BRANCH
Now, how was that generated? Is this part of the "tm" module?
Yes, this is part of TM module as well. This behavior is required by RFC.
And then when I get this ACK:
#
U 2006/11/06 18:40:10.772875 CUSTOMER-IP:5060 -> OPENSER-IP:5060
ACK sip:011445551212@OPENSER.FQDN:5060 SIP/2.0
From: <sip:CUST-PHONE-NUMBER@CUSTOMER-IP:5060;transport=UDP>;tag=TAG
To: <sip:011445551212@OPENSER.FQDN:5060;transport=UDP>;tag=20505
Call-ID: CALLID@CUSTOMER-IP
CSeq: 2 ACK
Via: SIP/2.0/UDP CUSTOMER-IP:5060;branch=BRANCH
Max-Forwards: 70
Contact: <sip:CUST-PHONE-NUMBER@CUSTOMER-IP:5060;transport=UDP>
Content-Length: 0
What should I do with it? I do nothing... if I should do nothing
is there any special way I should do it? Or is this just handled
by the tm module?
ACKs to negative replies are filtered out by SL module, since they are
intended to end to openser proxy.
Cheers,
Daniel
What I don't get is the CANCEL is directed AT my
openser box:
CANCEL sip:011445551212@OPENSER.FQDN:5060 SIP/2.0
To: <sip:011445551212@OPENSER.FQDN:5060;transport=UDP>
just like the ACK:
ACK sip:011445551212@OPENSER.FQDN:5060 SIP/2.0
To: <sip:011445551212@OPENSER.FQDN:5060;transport=UDP>;tag=20505
and I t_relay() the CANCEL but sit on the ACK...
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