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<font face="monospace">Hi Li,<br>
<br>
If I understand correctly, you try to improve the b2b support in
OpenSIPS in order to properly handle that NOTIFY for REFER, right
?<br>
<br>
Regards,<br>
</font>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="https://www.opensips-solutions.com">https://www.opensips-solutions.com</a>
OpenSIPS Summit 27-30 Sept 2022, Athens
<a class="moz-txt-link-freetext" href="https://www.opensips.org/events/Summit-2022Athens/">https://www.opensips.org/events/Summit-2022Athens/</a></pre>
<div class="moz-cite-prefix">On 7/22/22 11:02 PM, Li Cai wrote:<br>
</div>
<blockquote type="cite"
cite="mid:SA1PR09MB80004620A34C1A7EE463113E8E909@SA1PR09MB8000.namprd09.prod.outlook.com">
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<p class="MsoNormal"><span lang="EN-US">Hi experts,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’m working on the
implementation for ‘2.4.6 Multiple REFER Requests in a
Dialog’ of RFC3515 in a B2B SIP Proxy. Right now, I got
stuck with two problems in the solution. Please see the
paragraph from RFC- <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA"> A REFER
creates an implicit subscription sharing the dialog<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA">
identifiers in the REFER request. If more than one REFER is
issued<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA"> in the
same dialog (a second attempt at transferring a call for<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA">
example), the dialog identifiers do not provide enough
information to<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA">
associate the resulting NOTIFYs with the proper REFER.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA"> Thus,
for the second and subsequent REFER requests a UA receives
in a<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA"> given
dialog, it MUST include an id parameter[2] in the Event
header<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA"> field
of each NOTIFY containing the sequence number (the number
from<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA"> the
CSeq header field value) of the REFER this NOTIFY is
associated<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA"> with.
This id parameter MAY be included in NOTIFYs to the first<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA"> REFER a
UA receives in a given dialog. A SUBSCRIBE sent to refresh<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Courier
New";color:black;mso-fareast-language:EN-CA"> or
terminate this subscription MUST contain this id parameter.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Different from the
definition in RFC, the NOTIFY forwarded by the proxy
contains the same Id in Event header as the other side.
Please see the below chart –<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">
B2BProxy<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">
|
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <-
REFER 2 (Cseq=2) | <-REFER 1
(Cseq=1003)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">
. . . |
. . .<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">->NOTIFY 1 (event:<b>id=2</b>)
| ->NOTIFY 2 (<u>event<b>:id=2</b>)</u><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The current problem is,
the above NOTIFY on the right side should
<u>include ‘id=1003’ instead of ‘id=2’</u>.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The solution I’m trying
is as in the following flow –<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> 1. get
CSeq 1 of REFER 1 in route[b2b_request]{} -><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> 2. get
CSeq 2 of REFER 2 in local_route{}, then save the
pair(key=CSeq2, value=CSeq1) in a map set-><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> 3. get Id
from NOTIFY 1 event in route[b2b_request]{} -><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> 4. use Id
as key then get matched CSeq1 from the map set, use
remove_hf() and append_hf() to modify the event header in
local_route{}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">My two questions are:<o:p></o:p></span></p>
<ol style="margin-top:0cm" type="1" start="1">
<li class="MsoListParagraph"
style="margin-left:0cm;mso-list:l1 level1 lfo2"><span
lang="EN-US">To transfer Cseq 1 from step1 to step2, I
tried a variable in the AVP type but it didn’t work. The
script variable can work but it doesn’t fit because the
processing is based on per request. Can I ask if you have
any suggest on how to transfer the value from
route[b2b_request]{} to local_route{}? <o:p></o:p></span></li>
<li class="MsoListParagraph"
style="margin-left:0cm;mso-list:l1 level1 lfo2"><span
lang="EN-US">In the step2, I tried to create and operate a
JSON map set to save the CSeq pairs. But the JSON data
didn’t work for me.<o:p></o:p></span></li>
</ol>
<p class="MsoListParagraph"><span lang="EN-US"> My
source : <o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US"> $json(csList)
= ””; # Initialize the data set, not sure if it’s
correct<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US">
$json(csList/”$cs”) = “$avp(csNum)”;<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US"> The
error I got:<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US">
ERROR:core:do_assign: setting PV failed<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US">
ERROR:core:do_assign: error at
/usr/local//et/opensips/opensips.cfg:531<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you very much for
the help! Any your suggests are very welcomed.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Li<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p></o:p></span></p>
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