Please close request as I found out that this is required behaviour according to RFC

*Antony* satskiy.a@gmail.com +380669197533 +48727830247

On Sun, 10 Mar 2024 at 15:00, Fred Posner fred@pgpx.io wrote:

Do you have force_rport anywhere in the config?

-- Fred Posner Sent from mobile Phone: +1 (352) 664-3733 qxork.com

On Mar 10, 2024, at 8:37 AM, Antonio via sr-users < sr-users@lists.kamailio.org> wrote:

 Hi everyone I have a small question: i want to set up a basic SIP Redirect Server so I install Kamailio v5.3 and comment default request route and set simple

request_route { rewritehostport("1.2.3.4"); sl_send_reply("302", "Moved Temporarily"); }

but for some reason, Kamailio does not care about the port and sends a reply to 5060 <image.png>

i also tried to delete rewritehostport but it only deletes Contact: from the reply but reply itself is still sent to 5060 port <image.png>

-- *Antony* satskiy.a@gmail.com +380669197533 +48727830247 __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions To unsubscribe send an email to sr-users-leave@lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe:

As I was involed in this conversation via other channel, some comments on this to the community.

1. Kamailio is acting according to these parts of 3261 - https://www.rfc-editor.org/rfc/rfc3261.html#section-18.2.1

If the host portion of the "sent-by" parameter contains a domain name, or if it contains an IP address that differs from the packet source address, the server MUST add a "received" parameter to that Via header field value. This parameter MUST contain the source address from which the packet was received. This is to assist the server transport layer in sending the response, since it must be sent to the source IP address from which the request came.

Consider a request received by the server transport which looks like, in part:

INVITE sip:bob@Biloxi.com SIP/2.0 Via: SIP/2.0/UDP bobspc.biloxi.com:5060

The request is received with a source IP address of 192.0.2.4. Before passing the request up, the transport adds a "received" parameter, so that the request would look like, in part:

INVITE sip:bob@Biloxi.com SIP/2.0 Via: SIP/2.0/UDP bobspc.biloxi.com:5060;received=192.0.2.4

2. And forming a responce without force_rport() according to this https://www.rfc-editor.org/rfc/rfc3261.html#section-18.2.2

Otherwise (for unreliable unicast transports), if the top Via has a "received" parameter, the response MUST be sent to the address in the "received" parameter, using the port indicated in the "sent-by" value, or using port 5060 if none is specified explicitly.

So, the question was mainly why responce is sent back to the source address, but to a different ("default") port.

Consider this as a reading RFC 3261 outloud once again )

Le lun. 11 mars 2024 à 00:24, Ben Kaufman via sr-users < sr-users@lists.kamailio.org> a écrit :

Kind of depends on which RFC you’re talking about.

As Fred asked – do you have `force_rport` set? This is defined in RFC3581 https://www.ietf.org/rfc/rfc3581.txt. In an **ideal** world, your UAC would put the `rport` parameter (without value) in it’s Via header. Kamailio can be told to “consider this request like there’s an `rport` in the top most via header” by setting `force_rport`. This is what you want based on your description below.

Regards,

Kaufman

*From:* Antonio via sr-users sr-users@lists.kamailio.org *Sent:* Sunday, March 10, 2024 11:08 AM *To:* Fred Posner fred@pgpx.io *Cc:* Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org; Antonio satskiy.a@gmail.com *Subject:* [SR-Users] Re: SIP Redirect Server

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Please close request as I found out that this is required behaviour according to RFC

*Antony*

satskiy.a@gmail.com

+380669197533

+48727830247

On Sun, 10 Mar 2024 at 15:00, Fred Posner fred@pgpx.io wrote:

Do you have force_rport anywhere in the config?

-- Fred Posner

Sent from mobile

Phone: +1 (352) 664-3733

qxork.com

On Mar 10, 2024, at 8:37 AM, Antonio via sr-users < sr-users@lists.kamailio.org> wrote:



Hi everyone

I have a small question:

i want to set up a basic SIP Redirect Server

so I install Kamailio v5.3

and comment default request route and set simple

request_route {

rewritehostport("1.2.3.4");

sl_send_reply("302", "Moved Temporarily");

}

but for some reason, Kamailio does not care about the port and sends a reply to 5060

<image.png>

i also tried to delete rewritehostport

but it only deletes Contact: from the reply

but reply itself is still sent to 5060 port

<image.png>

--

*Antony*

satskiy.a@gmail.com

+380669197533

+48727830247

---

Kamailio - Users Mailing List - Non Commercial Discussions To unsubscribe send an email to sr-users-leave@lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe:

---

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