No subject


Wed Jan 27 21:05:54 CET 2016


The requirement for unique branch IDs across space and time applies to stat=
eless proxies as well.
However, a stateless proxy cannot simply use a random number generator to c=
ompute the first component of the branch ID, as described in Section 16.6 b=
ullet 8. This is because retransmissions of a request need to have the same=
 value, and a stateless proxy cannot tell a retransmission from the origina=
l request.
Therefore, the component of the branch parameter that makes it unique MUST =
be the same each time a retransmitted request is forwarded.
Thus for a stateless proxy, the branch parameter MUST be computed as a comb=
inatoric function of message parameters which are invariant on retransmissi=
on.

We are using the stateless implementation of opensips. As such we MUST not =
use the statefull  t_replay() function.
Copying the TOP most Via header branch will meet the requirement since that=
 branch value MUST also be "unique branch IDs across space and time."
However, just copying apart of that  destroys the "unique branch IDs across=
 space and time " requirement.

I'm confused because I can not find the requirement that you specified belo=
w in RFC 3261.

Thanks for your response.
Ray

Ray Elliott
Principal Scientist
777, Commerce Dr., Fairfield, CT 06825

T  +1 203 339 7052  M +1 203 848 4550 E ray.elliott at ipc.com<mailto:ray.elli=
ott at ipc.com>
Follow us on twitter: @ipc_Systems_Inc    www.ipc.com<http://www.ipc.com/>
[cid:image001.jpg at 01D19553.88C2B160]



From: Bogdan-Andrei Iancu [mailto:bogdan at opensips.org]
Sent: Thursday, July 07, 2016 4:43 AM
To: Gupta, Rahul
Cc: Elliott, Ray; users at lists.opensips.org
Subject: Re: [OpenSIPS-Users] Truncated Branch in Via

Hi Rahul,

The received VIA hdr (with the .44 IP) is properly preserved when forwardin=
g (in the outbound message).

The VIA hdr added by OpenSIPS ( .156 IP) is a completely new VIA and its br=
anch value is completely independent from the branch of other VIA hdrs.

Why do they look the same ? The RFC3261 says that for stateless fwd (when b=
asically there is no transaction, so no branch value), to avoid populating =
its VIA with ";branch=3D0" , the proxy may "copy" and use a branch value fr=
om an older VIA (a received VIA) - keep in mind it does not say to copy it =
entirely or part. So, OpenSIPS copies a MAX_BRANCH_PARAM_LEN length string =
from the previous branch param.

Everything is correct and legal (from RFC perspective).

PS: if you would use t_relay() instead of forward() - doing statefull proxy=
 -, you will see that the branch in the VIA added by OpenSIPS will be compl=
etly different from the value in the previous VIA.

Best regards,


Bogdan-Andrei Iancu

OpenSIPS Founder and Developer

http://www.opensips-solutions.com
On 07.07.2016 03:42, Gupta, Rahul wrote:
Hi Bogdan,

Here is a Ethernet trace (pcap) file that has a successful and an unsuccess=
ful registration.

Frames 1-8 illustrate the successful case with Frames 2 and 6 show how open=
sips adds an extra VIA header that has a full VIA;branch
Frame:2
Via: SIP/2.0/UDP 10.204.70.156:5060;branch=3Dz9hG4bK-c45d6-2ff0ce63-4583dc4=
5-6bd144f8
Via: SIP/2.0/UDP 10.204.45.122:5060;branch=3Dz9hG4bK-c45d6-2ff0ce63-4583dc4=
5-6bd144f8

Frames 9-16 illustrate the unsuccessful case where Frames 10 and 14 show ho=
w opensips adds an extra VIA header that has a truncated branch.
Frame 10:
Via: SIP/2.0/UDP 10.204.70.156:5060;branch=3Dz9hG4bK1c68e33e-848e-412a-9137=
-4fb065a7b7eb_0efbfc5e_11391
Via: SIP/2.0/UDP 10.205.236.44:5060;branch=3Dz9hG4bK1c68e33e-848e-412a-9137=
-4fb065a7b7eb_0efbfc5e_113915620064228_MTAuMTIuMy4xMQ

Thanks
Rahul Gupta
Systems Architect
T +1 732-690-3845  *   E rahul.gupta at ipc.com<mailto:rahul.gupta at ipc.com>

[cid:image006.jpg at 01D1940F.3E021840]



From: Bogdan-Andrei Iancu [mailto:bogdan at opensips.org]
Sent: Wednesday, July 06, 2016 5:38 AM
To: OpenSIPS users mailling list
Cc: Elliott, Ray; Gupta, Rahul
Subject: Re: [OpenSIPS-Users] Truncated Branch in Via

Hi Rahul,

That define is used to calculate the the max VIA len when OpenSIPS is gener=
ating its own VIA headers. That max len does not impact the VIA headers whi=
ch were received.

I do not understand exactly (in your example) what's the flow of that VIA h=
eader. If you want, send me off-list the pcap/ngrep showing the SIP package=
 (before and after OpenSIPS) and how it is affected.

Regards,



Bogdan-Andrei Iancu

OpenSIPS Founder and Developer

http://www.opensips-solutions.com
On 05.07.2016 20:57, Gupta, Rahul wrote:
We are using opensips 1.11.5 as a stateless proxy and seeing a truncated Br=
anch in Via for my REGISTER message. After some code digging, the MAX lengt=
h is calculated using the following formula and seems like its truncating t=
he branch after 55 characters. This is causing the REGISTER to fail in our =
case. Is there a config level solution to this ?

#define MAX_BRANCH_PARAM_LEN  (MCOOKIE_LEN+8 /*!<int2hex*/ + 1 /*sep*/ + \
                                MD5_LEN + 1 /*!<sep*/ + 8 /*int2hex*/ + \
                                1 /*extra space, needed by t_calc_branch*/)


truncated from opensips -->       Via: SIP/2.0/UDP XX.XX.XX.XX:5060;branch=
=3Dz9hG4bK0fddbbc9-1487-4755-a0b3-0c319155b8c3_0efbfc5e_11160
Via from EndPoint    -->                   Via: SIP/2.0/UDP XX.XX.XX.XX:506=
0;branch=3Dz9hG4bK0fddbbc9-1487-4755-a0b3-0c319155b8c3_0efbfc5e_11160783089=
24346_MTAuMTIuMy4xMQ


Thanks
Rahul Gupta


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi Bogdan,</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">I&#8217;m a bit confused.=
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">From RFC 3261 states in S=
ection 16.11 Stateless Proxy
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">The requirement for=
 unique branch IDs across space and time applies to stateless proxies as we=
ll.
</span></i></b><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">However, a stateless p=
roxy cannot simply use a random number generator to compute the first compo=
nent of the branch ID, as described in Section 16.6 bullet
 8. This is because retransmissions of a request need to have the same valu=
e, and a stateless proxy cannot tell a retransmission from the original req=
uest.</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Therefore, the comp=
onent of the branch parameter that makes it unique MUST be the same each ti=
me a retransmitted request is forwarded.</span></i></b><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Thus for a stateless p=
roxy, the branch parameter MUST be computed as a combinatoric function of m=
essage parameters which are invariant on retransmission.</span></i><o:p></o=
:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span></i><o:p>=
</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">We are using the stateles=
s implementation of opensips. As such we MUST not use the statefull &nbsp;t=
_replay() function.
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Copying the TOP most Via =
header branch will meet the requirement since that branch value MUST also b=
e &#8220;unique branch IDs across space and time.&#8221;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">However, just copying apa=
rt of that &nbsp;destroys the &#8220;unique branch IDs across space and tim=
e &#8220; requirement.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">I&#8217;m confused becaus=
e I can not find the requirement that you specified below in RFC 3261.</spa=
n><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Thanks for your response.=
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Ray</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.0pt;page-break-after:avoid"=
><b><span lang=3D"EN-GB" style=3D"font-family:&quot;Arial&quot;,&quot;sans-=
serif&quot;">Ray Elliott</span></b><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ve=
rdana&quot;,&quot;sans-serif&quot;;color:windowtext">Principal Scientist</s=
pan><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ve=
rdana&quot;,&quot;sans-serif&quot;;color:#1F497D">777, Commerce Dr., Fairfi=
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/p>
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family:&quot;Verdana&quot;,&quot;sans-serif&quot;;color:#1F497D">T&nbsp;</s=
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na&quot;,&quot;sans-serif&quot;;color:#1F497D"> &#43;1 203 339 7052&nbsp; M=
 &#43;1 203 848 4550
<b>E</b> <a href=3D"mailto:ray.elliott at ipc.com"><span style=3D"font-size:12=
.0pt">ray.elliott at ipc.com</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ve=
rdana&quot;,&quot;sans-serif&quot;;color:#1F497D">Follow us on twitter: @<s=
pan style=3D"text-transform:uppercase">ipc</span>_Systems_Inc&nbsp;&nbsp;&n=
bsp;
<a href=3D"http://www.ipc.com/"><span style=3D"font-size:12.0pt">www.ipc.co=
m</span></a></span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><img border=3D"0" width=
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.D6C03DD0" alt=3D"cid:image001.jpg at 01D19553.88C2B160"></span><o:p></o:p></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:windowtext">From:</span></b><sp=
an style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-ser=
if&quot;;color:windowtext"> Bogdan-Andrei Iancu [mailto:bogdan at opensips.org=
]
<br>
<b>Sent:</b> Thursday, July 07, 2016 4:43 AM<br>
<b>To:</b> Gupta, Rahul<br>
<b>Cc:</b> Elliott, Ray; users at lists.opensips.org<br>
<b>Subject:</b> Re: [OpenSIPS-Users] Truncated Branch in Via<o:p></o:p></sp=
an></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size:10.0pt">Hi Rahul,</span=
></tt><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">=
<br>
<br>
<tt>The received VIA hdr (with the .44 IP) is properly preserved when forwa=
rding (in the outbound message).</tt><br>
<br>
<tt>The VIA hdr added by OpenSIPS ( .156 IP) is a completely new VIA and it=
s branch value is completely independent from the branch of other VIA hdrs.=
</tt><br>
<br>
<tt>Why do they look the same ? The RFC3261 says that for stateless fwd (wh=
en basically there is no transaction, so no branch value), to avoid populat=
ing its VIA with &quot;;branch=3D0&quot; , the proxy may &quot;copy&quot; a=
nd use a branch value from an older VIA (a received VIA)
 - keep in mind it does not say to copy it entirely or part. So, OpenSIPS c=
opies a MAX_BRANCH_PARAM_LEN length string from the previous branch param.<=
/tt><br>
<br>
<tt>Everything is correct and legal (from RFC perspective). </tt><br>
<br>
<tt>PS: if you would use t_relay() instead of forward() - doing statefull p=
roxy -, you will see that the branch in the VIA added by OpenSIPS will be c=
ompletly different from the value in the previous VIA.
</tt><br>
<br>
<tt>Best regards,</tt><br>
<br>
</span><o:p></o:p></p>
<pre>Bogdan-Andrei Iancu<o:p></o:p></pre>
<pre>OpenSIPS Founder and Developer<o:p></o:p></pre>
<pre><a href=3D"http://www.opensips-solutions.com">http://www.opensips-solu=
tions.com</a><o:p></o:p></pre>
<div>
<p class=3D"MsoNormal">On 07.07.2016 03:42, Gupta, Rahul wrote:<o:p></o:p><=
/p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi Bogdan,</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Here is a Ethernet trace =
(pcap) file that has a successful and an unsuccessful registration.</span><=
o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Frames 1-8 illustrate the=
 successful case with Frames 2 and 6 show how opensips adds an extra VIA he=
ader that has a full VIA;branch</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Frame:2</span><o:p></o:p>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Via: SIP/2.0/UDP 10.204.7=
0.156:5060;branch=3Dz9hG4bK-c45d6-2ff0ce63-4583dc45-6bd144f8</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Via: SIP/2.0/UDP 10.204.4=
5.122:5060;branch=3Dz9hG4bK-c45d6-2ff0ce63-4583dc45-6bd144f8</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Frames 9-16 illustrate th=
e unsuccessful case where Frames 10 and 14 show how opensips adds an extra =
VIA header that has a truncated branch.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Frame 10:</span><o:p></o:=
p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Via: SIP/2.0/UDP 10.204.7=
0.156:5060;branch=3Dz9hG4bK1c68e33e-848e-412a-9137-4fb065a7b7eb_0efbfc5e_11=
391</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Via: SIP/2.0/UDP 10.205.2=
36.44:5060;branch=3Dz9hG4bK1c68e33e-848e-412a-9137-4fb065a7b7eb_0efbfc5e_11=
391</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&=
quot;sans-serif&quot;;color:red;background:yellow;mso-highlight:yellow">562=
0064228_MTAuMTIuMy4xMQ</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.0pt;page-break-after:avoid"=
><b><span lang=3D"EN-GB" style=3D"font-size:11.0pt">Thanks</span></b><o:p><=
/o:p></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:3.0pt;page-break-after:avoid"=
><b><span lang=3D"EN-GB" style=3D"font-size:11.0pt">Rahul Gupta</span></b><=
o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:6.0pt;page-break-after:avoid"=
><span lang=3D"EN-GB" style=3D"font-size:11.0pt;font-family:&quot;Calibri&q=
uot;,&quot;sans-serif&quot;;color:#1F4E79">Systems Architect</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><b><span lang=3D"FR" style=3D"font-size:10.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">T</span></=
b><span lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Calibri&quo=
t;,&quot;sans-serif&quot;;color:#1F497D"> &#43;1 732-690-3845&nbsp;
</span><span style=3D"font-size:10.0pt;font-family:Symbol;color:#5B9BD5">|<=
/span><span lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Calibri=
&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;&nbsp;
<b>E</b> <a href=3D"mailto:rahul.gupta at ipc.com"><span style=3D"color:#0563C=
1">rahul.gupta at ipc.com</span></a>
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><img border=3D"0" width=
=3D"163" height=3D"68" id=3D"Picture_x0020_2" src=3D"cid:image002.png at 01D1D=
9C6.D6C03DD0" alt=3D"cid:image006.jpg at 01D1940F.3E021840"></span><o:p></o:p>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p><=
/p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:windowtext">From:</span></b><sp=
an style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-ser=
if&quot;;color:windowtext"> Bogdan-Andrei Iancu [<a href=3D"mailto:bogdan at o=
pensips.org">mailto:bogdan at opensips.org</a>]
<br>
<b>Sent:</b> Wednesday, July 06, 2016 5:38 AM<br>
<b>To:</b> OpenSIPS users mailling list<br>
<b>Cc:</b> Elliott, Ray; Gupta, Rahul<br>
<b>Subject:</b> Re: [OpenSIPS-Users] Truncated Branch in Via</span><o:p></o=
:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><tt><span style=3D"font-size:10.0pt">Hi Rahul,</span=
></tt><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">=
<br>
<br>
<tt>That define is used to calculate the the max VIA len when OpenSIPS is g=
enerating its own VIA headers. That max len does not impact the VIA headers=
 which were received.</tt><br>
<br>
<tt>I do not understand exactly (in your example) what's the flow of that V=
IA header. If you want, send me off-list the pcap/ngrep showing the SIP pac=
kage (before and after OpenSIPS) and how it is affected.</tt><br>
<br>
<tt>Regards,</tt><br>
<br>
<br>
</span><o:p></o:p></p>
<pre>Bogdan-Andrei Iancu<o:p></o:p></pre>
<pre>OpenSIPS Founder and Developer<o:p></o:p></pre>
<pre><a href=3D"http://www.opensips-solutions.com">http://www.opensips-solu=
tions.com</a><o:p></o:p></pre>
<div>
<p class=3D"MsoNormal">On 05.07.2016 20:57, Gupta, Rahul wrote:<o:p></o:p><=
/p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">We are using opensips 1.11.5 as a state=
less proxy and seeing a truncated Branch in Via for my REGISTER message. Af=
ter some code digging, the MAX length is calculated using
 the following formula and seems like its truncating the branch after 55 ch=
aracters. This is causing the REGISTER to fail in our case. Is there a conf=
ig level solution to this ?</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;">#define MAX_BRANCH_PARAM_LEN&nbsp; (=
MCOOKIE_LEN&#43;8 /*!&lt;int2hex*/ &#43; 1 /*sep*/ &#43; \</span></b><o:p><=
/o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 MD5_LEN &#43; 1 /*!&lt;sep*/ &#43; 8 /*int2hex*/ &#43; \</span></b><o:p></=
o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 1 /*extra space, needed by t_calc_branch*/)</span></b><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">truncated from opensips
</span><span style=3D"font-size:11.0pt;font-family:Wingdings;color:#1F497D"=
>&agrave;</span><span style=3D"font-size:11.0pt;color:#1F497D">&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;</span><span style=3D"font-size:11.0pt;font-family:=
Wingdings;color:#1F497D">
</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quo=
t;sans-serif&quot;;color:#1F497D">Via: SIP/2.0/UDP XX.XX.XX.XX:5060;branch=
=3Dz9hG4bK0fddbbc9-1487-4755-a0b3-0c319155b8c3_0efbfc5e_11160&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</=
span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Via from EndPoint&nbsp;&n=
bsp;&nbsp;&nbsp;</span><span style=3D"font-size:11.0pt;font-family:Wingding=
s;color:#1F497D">&agrave;</span><span style=3D"font-size:11.0pt;font-family=
:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;
 Via: SIP/2.0/UDP XX.XX.XX.XX:5060;branch=3Dz9hG4bK0fddbbc9-1487-4755-a0b3-=
0c319155b8c3_0efbfc5e_11160<span style=3D"background:yellow">78308924346_MT=
AuMTIuMy4xMQ</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;</span><o:p></o:p></p>
</div>
<div style=3D"margin-bottom:3.0pt">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt">Thanks</span></b=
><o:p></o:p></p>
</div>
<div style=3D"margin-bottom:3.0pt">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt">Rahul Gupta</spa=
n></b><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">DISCLAIMER: This e-mail may contain information that=
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 are not an intended recipient of this e-mail, do not duplicate or redistri=
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<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><br>
<br>
<br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Users mailing list<o:p></o:p></pre>
<pre><a href=3D"mailto:Users at lists.opensips.org">Users at lists.opensips.org</=
a><o:p></o:p></pre>
<pre><a href=3D"http://lists.opensips.org/cgi-bin/mailman/listinfo/users">h=
ttp://lists.opensips.org/cgi-bin/mailman/listinfo/users</a><o:p></o:p></pre=
>
</blockquote>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</blockquote>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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