Re: Best approach for 2-node active-active Kamailio setup

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Subject: Re: DMQ setup =E2=80=94 follow-up on security and media takeover

Hi,

Thank you very much for the clarification, this is very helpful.

Two follow-up questions if I may:

1. Regarding securing DMQ over the internet between the two datacenters =E2=
=80=94
what would you recommend concretely? Would a VPN tunnel between the two
nodes be sufficient, or is there a native Kamailio mechanism (e.g. TLS on
the DMQ channel itself) that you would recommend instead?

2. Regarding the media takeover mechanism you mentioned as being more
complex =E2=80=94 could you point me to any documentation, module, or gener=
al
approach to investigate? I understand DMQ only replicates dialog
information, and I'd like to understand what additional piece would be
needed if we wanted in-progress calls to survive a failover, even as a
future improvement.

For now we are planning to run Active/Passive without DMQ, with failover
handled by the SIP operator via OPTIONS ping. We may revisit DMQ later once
the above points are clarified.

Thanks again for your time.

Best regards,
Asmaa

Le mer. 8 juil. 2026 =C3=A0 21:07, Henning Westerholt <[email protected]> a =C3=
=A9crit :

> Hello Asma,
>
>
>
> This are fairly modest requirements from the CPS side.
>
>
>
> DMQ should be fine for this kind of setup. Just keep in mind that DMQ is
> not designed to run over the unprotected internet, consider adding some
> security to your cfg. It also does not provide a full call take over; it
> merely replicates the dialog information. For media proxy take over you
> also need to investigate other mechanism, this is more complicated to set=
up.
>
>
>
> Use the latest Kamailio stable version, e.g. 6.1.3 for a new setup.
>
>
>
> Cheers,
>
>
>
> Henning
>
>
>
> *From:* Asma BOUDDYACH <[email protected]>
> *Sent:* Mittwoch, 8. Juli 2026 17:06
> *To:* Henning Westerholt <[email protected]>
> *Cc:* Kamailio (SER) - Users Mailing List <[email protected]>
> *Subject:* Re: [SR-Users] Best approach for 2-node active-active Kamailio
> setup
>
>
>
> Hi Henning
>
>
>
>
> Thank you for your  reply
>
> I am deploying a 2-node Kamailio SBC infrastructure with the following
> setup:
>
>
> - Node 1 : Datacenter 1
> - Node 2 : Datacenter 2
> - Maximum simultaneous calls : 54
> - Use case : SBC in front of a 3CX IPBX
>
> Given the current state of DMQ dialog fixes (active-active still having
> issues PR #4774 pointer.), I am considering an active-passive setup with
> DMQ synchronization, so that in-progress calls are maintained when Node 1
> fails and Node 2 takes over.
>
> My questions are:
>
> 1. Is active-passive with DMQ dialog synchronization stable enough today
> for production use?
>
> 2. Which Kamailio version would you recommend for this setup?
>
> 3. Are there any specific DMQ configuration recommendations for an
> active-passive setup between 2 datacenters?
>
> Thank you very much for your guidance.
>
>
>
> Le mer. 8 juil. 2026 =C3=A0 16:41, Henning Westerholt <[email protected]> a =
=C3=A9crit :
>
> Hello,
>
>
>
> It=E2=80=99s a bit hard to give a conclusive answer to this, as it=E2=80=
=99s a matter of
> taste and also of course depends on the requirements.
>
>
>
> Have a look to the past year KamailioWorld conferences talk, which you ca=
n
> find e.g. on youtube. You will get many inspirations for these topics.
>
>
>
> You can also find older discussions of these topics in our mailing list
> archives, or with search engines.
>
>
>
> Cheers,
>
>
>
> Henning
>
>
>
>
>
> --
>
> Henning Westerholt
>
> Kamailio services =E2=80=93 https://gilawa.com
>
>
>
> *From:* Asma BOUDDYACH via sr-users <[email protected]>
> *Sent:* Mittwoch, 8. Juli 2026 15:44
> *To:* asma.bouddyach--- via sr-users <[email protected]>
> *Cc:* Asma BOUDDYACH <[email protected]>
> *Subject:* [SR-Users] Best approach for 2-node active-active Kamailio
> setup
>
>
>
> Hi ,
>
> I am currently deploying a Kamailio SBC infrastructure with 2 nodes, one
> per datacenter, and I would like to set them up in active-active mode.
>
> I have no experience yet with multi-node Kamailio setups and I would like
> to ask:
>
> 1. What is the recommended approach for a 2-node active-active Kamailio
> deployment today?
>
> 2. What modules or mechanisms should I use to synchronize state between
> the two nodes (calls, registrations, etc.)?
>
> 3. Are there any known issues or limitations I should be aware of before
> starting the configuration?
>
> Any guidance or documentation pointers would be greatly appreciated.
>
> Best regards,
>
>
>
> This message and any of its attachments is intended solely for the
> addresses and is confidential. If you receive this message in error, plea=
se
> delete it and immediately notify the sender. Any use not in accord with i=
ts
> purpose, any dissemination or disclosure, either whole or partial, is
> prohibited except formal approval. The internet cannot guarantee the
> integrity of this message. The INTELCIA Group shall (will) not therefore =
be
> liable for the message if modified.
>
> =E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=
=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94
>
> Ce message et toutes les pi=C3=A8ces jointes sont =C3=A9tablis =C3=A0 l'i=
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>
>
>
> This message and any of its attachments is intended solely for the
> addresses and is confidential. If you receive this message in error, plea=
se
> delete it and immediately notify the sender. Any use not in accord with i=
ts
> purpose, any dissemination or disclosure, either whole or partial, is
> prohibited except formal approval. The internet cannot guarantee the
> integrity of this message. The INTELCIA Group shall (will) not therefore =
be
> liable for the message if modified.
>
> =E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=
=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94
>
> Ce message et toutes les pi=C3=A8ces jointes sont =C3=A9tablis =C3=A0 l'i=
ntention
> exclusive de ses destinataires et sont confidentiels. Si vous recevez ce
> message par erreur, merci de le d=C3=A9truire et d=E2=80=99en avertir imm=
=C3=A9diatement
> l=E2=80=99exp=C3=A9diteur. Toute utilisation de ce message non conforme =
=C3=A0 sa
> destination, toute diffusion ou toute publication, m=C3=AAme partielle, e=
st
> interdite, sauf autorisation expresse. L=E2=80=99internet ne permettant p=
as
> d=E2=80=99assurer l=E2=80=99int=C3=A9grit=C3=A9 de ce message, le groupe =
INTELCIA d=C3=A9cline toute
> responsabilit=C3=A9 au titre de ce message, dans l=E2=80=99hypoth=C3=A8se=
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>

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This message and any of its attachments is intended
solely for the addresses and is confidential. If you receive this message=
=20
in
error, please delete it and immediately notify the sender. Any use not=20
in
accord with its purpose, any dissemination or disclosure, either whole=20
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not therefore be
liable for the message if modified.



=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=
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ses destinataires et sont confidentiels. Si vous recevez ce=20
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merci de le d=C3=A9truire et d=E2=80=99en avertir imm=C3=A9diatement=20
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utilisation de ce message non conforme =C3=A0 sa=20
destination, toute diffusion ou
toute publication, m=C3=AAme partielle, est=20
interdite, sauf autorisation expresse.
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d=E2=80=99assurer l=E2=80=99int=C3=A9grit=C3=A9 de ce message, le groupe
INTELCIA d=C3=A9cline toute=20
responsabilit=C3=A9 au titre de ce message, dans l=E2=80=99hypoth=C3=A8se
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Subject: Re: DMQ setup =E2=80=94 follow-up on security and=
 media takeover<br><br>Hi,<br><br>Thank you very much for the clarification=
, this is very helpful.<br><br>Two follow-up questions if I may:<br><br>1. =
Regarding securing DMQ over the internet between the two datacenters =E2=80=
=94 what would you recommend concretely? Would a VPN tunnel between the two=
 nodes be sufficient, or is there a native Kamailio mechanism (e.g. TLS on =
the DMQ channel itself) that you would recommend instead?<br><br>2. Regardi=
ng the media takeover mechanism you mentioned as being more complex =E2=80=
=94 could you point me to any documentation, module, or general approach to=
 investigate? I understand DMQ only replicates dialog information, and I&#3=
9;d like to understand what additional piece would be needed if we wanted i=
n-progress calls to survive a failover, even as a future improvement.<br><b=
r>For now we are planning to run Active/Passive without DMQ, with failover =
handled by the SIP operator via OPTIONS ping. We may revisit DMQ later once=
 the above points are clarified.<br><br>Thanks again for your time.<br><br>=
Best regards,<br>Asmaa</div><br><div class=3D"gmail_quote gmail_quote_conta=
iner"><div dir=3D"ltr" class=3D"gmail_attr">Le=C2=A0mer. 8 juil. 2026 =C3=
=A0=C2=A021:07, Henning Westerholt &lt;<a href=3D"mailto:[email protected]">hw@=
gilawa.com</a>&gt; a =C3=A9crit=C2=A0:<br></div><blockquote class=3D"gmail_=
quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,=
204);padding-left:1ex"><div class=3D"msg2487039730875700449">





<div lang=3D"EN-GB" style=3D"overflow-wrap: break-word;">
<div class=3D"m_2487039730875700449WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Hello Asma,<u></u><u>=
</u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">This are fairly modes=
t requirements from the CPS side.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">DMQ should be fine fo=
r this kind of setup. Just keep in mind that DMQ is not designed to run ove=
r the unprotected internet, consider adding some security to your cfg. It a=
lso does
 not provide a full call take over; it merely replicates the dialog informa=
tion. For media proxy take over you also need to investigate other mechanis=
m, this is more complicated to setup.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Use the latest Kamail=
io stable version, e.g. 6.1.3 for a new setup.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Cheers,<u></u><u></u>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Henning<u></u><u></u>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt"><u></u>=C2=A0<u></u><=
/span></p>
<div style=3D"border-width:medium medium medium 1.5pt;border-style:none non=
e none solid;border-color:currentcolor currentcolor currentcolor blue;paddi=
ng:0cm 0cm 0cm 4pt">
<div>
<div style=3D"border-width:1pt medium medium;border-style:solid none none;b=
order-color:rgb(225,225,225) currentcolor currentcolor;padding:3pt 0cm 0cm"=
>
<p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri,sans-serif">Fr=
om:</span></b><span style=3D"font-family:Calibri,sans-serif"> Asma BOUDDYAC=
H &lt;<a href=3D"mailto:[email protected]" target=3D"_blank">asma=
[email protected]</a>&gt;
<br>
<b>Sent:</b> Mittwoch, 8. Juli 2026 17:06<br>
<b>To:</b> Henning Westerholt &lt;<a href=3D"mailto:[email protected]" target=
=3D"_blank">[email protected]</a>&gt;<br>
<b>Cc:</b> Kamailio (SER) - Users Mailing List &lt;<a href=3D"mailto:sr-use=
[email protected]" target=3D"_blank">[email protected]</a>&gt=
;<br>
<b>Subject:</b> Re: [SR-Users] Best approach for 2-node active-active Kamai=
lio setup<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hi=C2=A0Henning<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><br>
Thank you for your=C2=A0 reply=C2=A0<br>
<br>
I am deploying a 2-node Kamailio SBC infrastructure with the following setu=
p:<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12pt"><br>
- Node 1 : Datacenter 1<br>
- Node 2 : Datacenter 2<br>
- Maximum simultaneous calls : 54<br>
- Use case : SBC in front of a 3CX IPBX<br>
<br>
Given the current state of DMQ dialog fixes (active-active still having iss=
ues PR #4774 pointer.), I am considering an active-passive setup with DMQ s=
ynchronization, so that in-progress calls are maintained when Node 1 fails =
and Node 2 takes over.<br>
<br>
My questions are:<br>
<br>
1. Is active-passive with DMQ dialog synchronization stable enough today fo=
r production use?<br>
<br>
2. Which Kamailio version would you recommend for this setup?<br>
<br>
3. Are there any specific DMQ configuration recommendations for an active-p=
assive setup between 2 datacenters?<br>
<br>
Thank you very much for your guidance.<br>
<br>
<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">Le=C2=A0mer. 8 juil. 2026 =C3=A0=C2=A016:41, Henning=
 Westerholt &lt;<a href=3D"mailto:[email protected]" target=3D"_blank">hw@gilaw=
a.com</a>&gt; a =C3=A9crit=C2=A0:<u></u><u></u></p>
</div>
<blockquote style=3D"border-width:medium medium medium 1pt;border-style:non=
e none none solid;border-color:currentcolor currentcolor currentcolor rgb(2=
04,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Hello,</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">It=E2=80=99s a bit ha=
rd to give a conclusive answer to this, as it=E2=80=99s a matter of taste a=
nd also of course depends on the requirements.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Have a look to the pa=
st year KamailioWorld conferences talk, which you can find e.g. on youtube.=
 You will get many inspirations for these topics.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">You can also find old=
er discussions of these topics in our mailing list archives, or with search=
 engines.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Cheers,</span><u></u>=
<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Henning</span><u></u>=
<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">--
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Henning Westerholt</s=
pan><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">Kamailio services =E2=
=80=93
</span><span lang=3D"DE" style=3D"font-size:11pt"><a href=3D"https://gilawa=
.com/" target=3D"_blank"><span lang=3D"EN-GB" style=3D"color:rgb(5,99,193)"=
>https://gilawa.com</span></a></span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border-width:medium medium medium 1.5pt;border-style:none non=
e none solid;padding:0cm 0cm 0cm 4pt;border-color:currentcolor currentcolor=
 currentcolor blue">
<div>
<div style=3D"border-width:1pt medium medium;border-style:solid none none;p=
adding:3pt 0cm 0cm;border-color:currentcolor">
<p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri,sans-serif">Fr=
om:</span></b><span style=3D"font-family:Calibri,sans-serif"> Asma BOUDDYAC=
H via sr-users &lt;<a href=3D"mailto:[email protected]" target=3D=
"_blank">[email protected]</a>&gt;
<br>
<b>Sent:</b> Mittwoch, 8. Juli 2026 15:44<br>
<b>To:</b> asma.bouddyach--- via sr-users &lt;<a href=3D"mailto:sr-users@li=
sts.kamailio.org" target=3D"_blank">[email protected]</a>&gt;<br>
<b>Cc:</b> Asma BOUDDYACH &lt;<a href=3D"mailto:[email protected]=
" target=3D"_blank">[email protected]</a>&gt;<br>
<b>Subject:</b> [SR-Users] Best approach for 2-node active-active Kamailio =
setup</span><u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">Hi ,<br>
<br>
I am currently deploying a Kamailio SBC infrastructure with 2 nodes, one pe=
r datacenter, and I would like to set them up in active-active mode.<br>
<br>
I have no experience yet with multi-node Kamailio setups and I would like t=
o ask:<br>
<br>
1. What is the recommended approach for a 2-node active-active Kamailio dep=
loyment today?<br>
<br>
2. What modules or mechanisms should I use to synchronize state between the=
 two nodes (calls, registrations, etc.)?<br>
<br>
3. Are there any known issues or limitations I should be aware of before st=
arting the configuration?<br>
<br>
Any guidance or documentation pointers would be greatly appreciated.<br>
<br>
Best regards,<u></u><u></u></p>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-se=
rif;color:rgb(31,73,125)">This message and any of its attachments is intend=
ed solely for the addresses and is confidential. If you receive this messag=
e in error, please delete it and immediately
 notify the sender. Any use not in accord with its purpose, any disseminati=
on or disclosure, either whole or partial, is prohibited except formal appr=
oval. The internet cannot guarantee the integrity of this message. The INTE=
LCIA Group shall (will) not therefore
 be liable for the message if modified.</span><u></u><u></u></p>
<p><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(3=
1,73,125)">=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=
=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94</s=
pan><u></u><u></u></p>
<p><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(3=
1,73,125)">Ce message et toutes les pi=C3=A8ces jointes sont =C3=A9tablis =
=C3=A0 l&#39;intention exclusive de ses destinataires et sont confidentiels=
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e utilisation de ce message non conforme =C3=A0 sa destination, toute diffu=
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</div>
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</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-se=
rif;color:rgb(31,73,125)">This message and any of its attachments is intend=
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oval. The internet cannot guarantee the integrity of this message. The INTE=
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<p><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(3=
1,73,125)">=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=
=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94</s=
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ation expresse. L=E2=80=99internet ne permettant pas d=E2=80=99assurer l=E2=
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<p><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(3=
1,73,125)" lang=3D"EN-US">This message and any of its attachments is intend=
ed
solely for the addresses and is confidential. If you receive this message i=
n
error, please delete it and immediately notify the sender. Any use not in
accord with its purpose, any dissemination or disclosure, either whole or
partial, is prohibited except formal approval. The internet cannot guarante=
e
the integrity of this message. The INTELCIA Group shall (will) not therefor=
e be
liable for the message if modified.</span><span></span></p>

<p><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(3=
1,73,125)">=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=
=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94</s=
pan><span></span></p>

<p><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(3=
1,73,125)">Ce
message et toutes les pi=C3=A8ces jointes sont =C3=A9tablis =C3=A0 l&#39;in=
tention exclusive de
ses destinataires et sont confidentiels. Si vous recevez ce message par err=
eur,
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utilisation de ce message non conforme =C3=A0 sa destination, toute diffusi=
on ou
toute publication, m=C3=AAme partielle, est interdite, sauf autorisation ex=
presse.
L=E2=80=99internet ne permettant pas d=E2=80=99assurer l=E2=80=99int=C3=A9g=
rit=C3=A9 de ce message, le groupe
INTELCIA d=C3=A9cline toute responsabilit=C3=A9 au titre de ce message, dan=
s l=E2=80=99hypoth=C3=A8se
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