How to hide Via and Record-Route header to external network and restore them to internal network?

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Anthony Blandin

1 Sep 2022 1 Sep '22

8:58 a.m.

Hi Community,

I have set up a SBC with Kamailio. I am testing voice call from external network to my network and voice call from my network to external network. When I send SIP messages to external network, I want to hide Via and Record-Route headers but when I receive replies from the external network I want to restore these Via and Record-Route headers to my network. How to store and restore these headers in Kamailio configuration ? Could you help on this? Thanks

Anthony Blandin

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Henning Westerholt

1 Sep 1 Sep

9:01 a.m.

Hello,

already investigated the topology hiding modules (topos, topoh)? They might be not doing exactly what you are describing, but usually are used for this kind of scenarios.

Cheers,

Henning

-- Henning Westerholt - https://skalatan.de/blog/ Kamailio services - https://gilawa.com https://gilawa.com/

From: sr-users sr-users-bounces@lists.kamailio.org On Behalf Of Anthony Blandin Sent: Thursday, September 1, 2022 10:58 AM To: sr-users@lists.kamailio.org Subject: [SR-Users] How to hide Via and Record-Route header to external network and restore them to internal network?

Hi Community,

Anthony Blandin

9:08 a.m.

Hi Henning,

Yes, I looked to topoh to hide topology but I didn't find a way to restore back the Via and Record-Route headers when I get replies from the external network. Regards,

Anthony ________________________________ De : Henning Westerholt hw@gilawa.com Envoyé : jeudi 1 septembre 2022 11:01 À : Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Cc : Anthony Blandin anthony.blandin@airnity.com Objet : RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hello,

already investigated the topology hiding modules (topos, topoh)? They might be not doing exactly what you are describing, but usually are used for this kind of scenarios.

Cheers,

Henning

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

Hi Community,

I have set up a SBC with Kamailio.

I am testing voice call from external network to my network and voice call from my network to external network.

When I send SIP messages to external network, I want to hide Via and Record-Route headers but when I receive replies from the external network I want to restore these Via and Record-Route headers to my network.

How to store and restore these headers in Kamailio configuration ?

Could you help on this?

Thanks

Anthony Blandin

Henning Westerholt

9:16 a.m.

Hi Anthony,

the restore happens internally and in the configuration you are able to access the headers, this is transparent for you. Just give it a try in your lab, you can easily see it on the network.

Cheers,

Henning

-- Henning Westerholt - https://skalatan.de/blog/ Kamailio services - https://gilawa.com https://gilawa.com/

From: Anthony Blandin anthony.blandin@airnity.com Sent: Thursday, September 1, 2022 11:08 AM To: Henning Westerholt hw@gilawa.com; Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Subject: RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Hi Henning,

Yes, I looked to topoh to hide topology but I didn't find a way to restore back the Via and Record-Route headers when I get replies from the external network. Regards,

Anthony ________________________________ De : Henning Westerholt <hw@gilawa.commailto:hw@gilawa.com> Envoyé : jeudi 1 septembre 2022 11:01 À : Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org> Cc : Anthony Blandin <anthony.blandin@airnity.commailto:anthony.blandin@airnity.com> Objet : RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.commailto:hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hello,

already investigated the topology hiding modules (topos, topoh)? They might be not doing exactly what you are describing, but usually are used for this kind of scenarios.

Cheers,

Henning

Henning Westerholt - https://skalatan.de/blog/

Kamailio services - https://gilawa.com https://gilawa.com/

From: sr-users <sr-users-bounces@lists.kamailio.orgmailto:sr-users-bounces@lists.kamailio.org> On Behalf Of Anthony Blandin Sent: Thursday, September 1, 2022 10:58 AM To: sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org Subject: [SR-Users] How to hide Via and Record-Route header to external network and restore them to internal network?

Hi Community,

I have set up a SBC with Kamailio.

I am testing voice call from external network to my network and voice call from my network to external network.

How to store and restore these headers in Kamailio configuration ?

Could you help on this?

Thanks

Anthony Blandin

9:42 a.m.

Thanks Henning. I will try it. How topoh determines that it is a SIP message to be sent outside my network or not?

Anthony ________________________________ De : Henning Westerholt hw@gilawa.com Envoyé : jeudi 1 septembre 2022 11:16 À : Anthony Blandin anthony.blandin@airnity.com; Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Objet : RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hi Anthony,

the restore happens internally and in the configuration you are able to access the headers, this is transparent for you.

Just give it a try in your lab, you can easily see it on the network.

Cheers,

Henning

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

Hi Henning,

Yes, I looked to topoh to hide topology but I didn't find a way to restore back the Via and Record-Route headers when I get replies from the external network.

Regards,

Anthony

________________________________

De : Henning Westerholt <hw@gilawa.commailto:hw@gilawa.com> Envoyé : jeudi 1 septembre 2022 11:01 À : Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org> Cc : Anthony Blandin <anthony.blandin@airnity.commailto:anthony.blandin@airnity.com> Objet : RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.commailto:hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hello,

already investigated the topology hiding modules (topos, topoh)? They might be not doing exactly what you are describing, but usually are used for this kind of scenarios.

Cheers,

Henning

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

Hi Community,

I have set up a SBC with Kamailio.

I am testing voice call from external network to my network and voice call from my network to external network.

How to store and restore these headers in Kamailio configuration ?

Could you help on this?

Thanks

Anthony Blandin

Henning Westerholt

10:14 a.m.

Hello,

the topology hiding is applied to both sides, so the modules not care. You can control execution with parameters and also some event route, depending on the module and Kamailio version. Just note if you want the headers to really removed from the message, consider using topos with a SQL DB or redis.

Cheers,

Henning

-- Henning Westerholt - https://skalatan.de/blog/ Kamailio services - https://gilawa.com https://gilawa.com/

From: Anthony Blandin anthony.blandin@airnity.com Sent: Thursday, September 1, 2022 11:42 AM To: Henning Westerholt hw@gilawa.com; Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Subject: RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Thanks Henning. I will try it. How topoh determines that it is a SIP message to be sent outside my network or not?

Anthony ________________________________ De : Henning Westerholt <hw@gilawa.commailto:hw@gilawa.com> Envoyé : jeudi 1 septembre 2022 11:16 À : Anthony Blandin <anthony.blandin@airnity.commailto:anthony.blandin@airnity.com>; Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org> Objet : RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.commailto:hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hi Anthony,

the restore happens internally and in the configuration you are able to access the headers, this is transparent for you.

Just give it a try in your lab, you can easily see it on the network.

Cheers,

Henning

Henning Westerholt - https://skalatan.de/blog/

Kamailio services - https://gilawa.com https://gilawa.com/

From: Anthony Blandin <anthony.blandin@airnity.commailto:anthony.blandin@airnity.com> Sent: Thursday, September 1, 2022 11:08 AM To: Henning Westerholt <hw@gilawa.commailto:hw@gilawa.com>; Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org> Subject: RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Hi Henning,

Yes, I looked to topoh to hide topology but I didn't find a way to restore back the Via and Record-Route headers when I get replies from the external network.

Regards,

Anthony

________________________________

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.commailto:hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hello,

already investigated the topology hiding modules (topos, topoh)? They might be not doing exactly what you are describing, but usually are used for this kind of scenarios.

Cheers,

Henning

Henning Westerholt - https://skalatan.de/blog/

Kamailio services - https://gilawa.com https://gilawa.com/

Hi Community,

I have set up a SBC with Kamailio.

I am testing voice call from external network to my network and voice call from my network to external network.

How to store and restore these headers in Kamailio configuration ?

Could you help on this?

Thanks

Anthony Blandin

1:26 p.m.

Hello,

I tried topoh and topology hiding is working well towards the external network but it does not restore the Via and Record-Route on the replies. Maybe I miss something in the configuration, I attached a pcap file if you can help me. What I want is to restore all the Via and Record-Route headers from the incoming INVITE to the Session Progress returned back to the previous node. Thanks

Anthony ________________________________ De : Henning Westerholt hw@gilawa.com Envoyé : jeudi 1 septembre 2022 12:14 À : Anthony Blandin anthony.blandin@airnity.com; Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Objet : RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Hello,

the topology hiding is applied to both sides, so the modules not care. You can control execution with parameters and also some event route, depending on the module and Kamailio version.

Just note if you want the headers to really removed from the message, consider using topos with a SQL DB or redis.

Cheers,

Henning

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

Thanks Henning.

I will try it.

How topoh determines that it is a SIP message to be sent outside my network or not?

Anthony

________________________________

De : Henning Westerholt <hw@gilawa.commailto:hw@gilawa.com> Envoyé : jeudi 1 septembre 2022 11:16 À : Anthony Blandin <anthony.blandin@airnity.commailto:anthony.blandin@airnity.com>; Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org> Objet : RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.commailto:hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hi Anthony,

the restore happens internally and in the configuration you are able to access the headers, this is transparent for you.

Just give it a try in your lab, you can easily see it on the network.

Cheers,

Henning

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

Hi Henning,

Yes, I looked to topoh to hide topology but I didn't find a way to restore back the Via and Record-Route headers when I get replies from the external network.

Regards,

Anthony

________________________________

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.commailto:hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hello,

already investigated the topology hiding modules (topos, topoh)? They might be not doing exactly what you are describing, but usually are used for this kind of scenarios.

Cheers,

Henning

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

Hi Community,

I have set up a SBC with Kamailio.

I am testing voice call from external network to my network and voice call from my network to external network.

How to store and restore these headers in Kamailio configuration ?

Could you help on this?

Thanks

Anthony Blandin

Henning Westerholt

2 Sep 2 Sep

7:44 a.m.

Hello,

as mentioned, this is not the way the module works. I will just not differ between internal and external. Why you need the topology information on the inside?

Cheers,

Henning

-- Henning Westerholt - https://skalatan.de/blog/ Kamailio services - https://gilawa.com https://gilawa.com/

From: Anthony Blandin anthony.blandin@airnity.com Sent: Thursday, September 1, 2022 3:26 PM To: Henning Westerholt hw@gilawa.com; Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Subject: RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Hello,

Anthony ________________________________ De : Henning Westerholt <hw@gilawa.commailto:hw@gilawa.com> Envoyé : jeudi 1 septembre 2022 12:14 À : Anthony Blandin <anthony.blandin@airnity.commailto:anthony.blandin@airnity.com>; Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org> Objet : RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Hello,

the topology hiding is applied to both sides, so the modules not care. You can control execution with parameters and also some event route, depending on the module and Kamailio version.

Just note if you want the headers to really removed from the message, consider using topos with a SQL DB or redis.

Cheers,

Henning

Henning Westerholt - https://skalatan.de/blog/

Kamailio services - https://gilawa.com https://gilawa.com/

From: Anthony Blandin <anthony.blandin@airnity.commailto:anthony.blandin@airnity.com> Sent: Thursday, September 1, 2022 11:42 AM To: Henning Westerholt <hw@gilawa.commailto:hw@gilawa.com>; Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org> Subject: RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Thanks Henning.

I will try it.

How topoh determines that it is a SIP message to be sent outside my network or not?

Anthony

________________________________

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.commailto:hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hi Anthony,

the restore happens internally and in the configuration you are able to access the headers, this is transparent for you.

Just give it a try in your lab, you can easily see it on the network.

Cheers,

Henning

Henning Westerholt - https://skalatan.de/blog/

Kamailio services - https://gilawa.com https://gilawa.com/

Hi Henning,

Yes, I looked to topoh to hide topology but I didn't find a way to restore back the Via and Record-Route headers when I get replies from the external network.

Regards,

Anthony

________________________________

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.commailto:hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hello,

already investigated the topology hiding modules (topos, topoh)? They might be not doing exactly what you are describing, but usually are used for this kind of scenarios.

Cheers,

Henning

Henning Westerholt - https://skalatan.de/blog/

Kamailio services - https://gilawa.com https://gilawa.com/

Hi Community,

I have set up a SBC with Kamailio.

I am testing voice call from external network to my network and voice call from my network to external network.

How to store and restore these headers in Kamailio configuration ?

Could you help on this?

Thanks

Anthony Blandin

8:02 a.m.

Hello,

As you can see in the trace, SIP request from uac pass through several nodes before reaching the SBC. So when the SBC send back the reply inside my network, there is no more Via and route-record headers and the adjacent node is not able to route the SIP reply to the uac. Regards,

Anthony ________________________________ De : Henning Westerholt hw@gilawa.com Envoyé : vendredi 2 septembre 2022 09:44 À : Anthony Blandin anthony.blandin@airnity.com; Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Objet : RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Hello,

as mentioned, this is not the way the module works. I will just not differ between internal and external.

Why you need the topology information on the inside?

Cheers,

Henning

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

Hello,

I tried topoh and topology hiding is working well towards the external network but it does not restore the Via and Record-Route on the replies.

Maybe I miss something in the configuration, I attached a pcap file if you can help me.

What I want is to restore all the Via and Record-Route headers from the incoming INVITE to the Session Progress returned back to the previous node.

Thanks

Anthony

________________________________

De : Henning Westerholt <hw@gilawa.commailto:hw@gilawa.com> Envoyé : jeudi 1 septembre 2022 12:14 À : Anthony Blandin <anthony.blandin@airnity.commailto:anthony.blandin@airnity.com>; Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org> Objet : RE: How to hide Via and Record-Route header to external network and restore them to internal network?

Hello,

the topology hiding is applied to both sides, so the modules not care. You can control execution with parameters and also some event route, depending on the module and Kamailio version.

Just note if you want the headers to really removed from the message, consider using topos with a SQL DB or redis.

Cheers,

Henning

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

Thanks Henning.

I will try it.

How topoh determines that it is a SIP message to be sent outside my network or not?

Anthony

________________________________

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.commailto:hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hi Anthony,

the restore happens internally and in the configuration you are able to access the headers, this is transparent for you.

Just give it a try in your lab, you can easily see it on the network.

Cheers,

Henning

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

Hi Henning,

Yes, I looked to topoh to hide topology but I didn't find a way to restore back the Via and Record-Route headers when I get replies from the external network.

Regards,

Anthony

________________________________

Vous ne recevez pas souvent de courriers de la part de hw@gilawa.commailto:hw@gilawa.com. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification

Hello,

already investigated the topology hiding modules (topos, topoh)? They might be not doing exactly what you are describing, but usually are used for this kind of scenarios.

Cheers,

Henning

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com https://gilawa.com/

Hi Community,

I have set up a SBC with Kamailio.

I am testing voice call from external network to my network and voice call from my network to external network.

How to store and restore these headers in Kamailio configuration ?

Could you help on this?

Thanks

Anthony Blandin

Richard Edmands

1 Sep 1 Sep

9:01 a.m.

Hi Anthony,

Fairly sure the topos module will do that automagically for you. Load, ensure you've got the DB for it. As long as your config is solid, then you should be fine.

On Thu, 1 Sept 2022 at 18:58, Anthony Blandin anthony.blandin@airnity.com wrote:

...

Hi Community,

I have set up a SBC with Kamailio. I am testing voice call from external network to my network and voice call from my network to external network. When I send SIP messages to external network, I want to hide Via and Record-Route headers but when I receive replies from the external network I want to restore these Via and Record-Route headers to my network. How to store and restore these headers in Kamailio configuration ? Could you help on this? Thanks

Anthony Blandin

Kamailio - Users Mailing List - Non Commercial Discussions

sr-users@lists.kamailio.org

Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe:

https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users

Paolo Visintin

9:05 a.m.

Hello Anthony, Topos module is what you need It saves the informations in a db (I suggest using redis for performance) and uses the contact header as a key for restoring datas.

Paolo

Il giorno gio 1 set 2022 alle 11:00 Anthony Blandin < anthony.blandin@airnity.com> ha scritto:

...

Hi Community,

I have set up a SBC with Kamailio. I am testing voice call from external network to my network and voice call from my network to external network. When I send SIP messages to external network, I want to hide Via and Record-Route headers but when I receive replies from the external network I want to restore these Via and Record-Route headers to my network. How to store and restore these headers in Kamailio configuration ? Could you help on this? Thanks

Anthony Blandin

Kamailio - Users Mailing List - Non Commercial Discussions

sr-users@lists.kamailio.org

Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe:

https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users

-- Paolo Visintin *evoseed s.r.l.* phone: +39 346 09 86 641 mail: paolo.visintin@evoseed.io site: evoseed.io address: Via Lucrezio 13, Trieste Italy

Anthony Blandin

2 Sep 2 Sep

1:51 p.m.

Hello,

Thank you very much! It's working with topos. I thought that topoh and topos was working in the same manner except using database but it's definitevely not the case. Thanks for your support.

Anthony ________________________________ De : sr-users sr-users-bounces@lists.kamailio.org de la part de Paolo Visintin paolo.visintin@evoseed.io Envoyé : jeudi 1 septembre 2022 11:05 À : Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Objet : Re: [SR-Users] How to hide Via and Record-Route header to external network and restore them to internal network?

Vous ne recevez pas souvent de courriers de la part de paolo.visintin@evoseed.io. Découvrez pourquoi cela est importanthttps://aka.ms/LearnAboutSenderIdentification Hello Anthony, Topos module is what you need It saves the informations in a db (I suggest using redis for performance) and uses the contact header as a key for restoring datas.

Paolo

Il giorno gio 1 set 2022 alle 11:00 Anthony Blandin <anthony.blandin@airnity.commailto:anthony.blandin@airnity.com> ha scritto: Hi Community,

Anthony Blandin

__________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users@lists.kamailio.orgmailto:sr-users@lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users -- [https://cdn.bulksignature.com/photo/761_101444293184792194488.jpg?v=2] Paolo Visintin

evoseed s.r.l.

phone: +39 346 09 86 641 mail: paolo.visintin@evoseed.iomailto:paolo.visintin@evoseed.io site: evoseed.iohttp://evoseed.io/ address: Via Lucrezio 13, Trieste Italy

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participants (4)

Anthony Blandin
Henning Westerholt
Paolo Visintin
Richard Edmands