[SR-Users] corex send()

Ross McKillop ross at rsmck.co.uk
Fri Nov 12 16:54:32 CET 2021


I know it doesn't make sense, it's a bit of a stop-gap solution that I had hoped would be simple and turned into anything but ;-)

Best,
Ross

> On 12 Nov 2021, at 14:45, ‪M S‬ <shaheryarkh at gmail.com> wrote:
> 
> you are trying to use Kamailio as transport bridge (TCP <-> TLS) but don't want to use it's transport bridge capabilities (Route & Via headers etc.), that doesn't makes sense...
> 
> But nevertheless, i think you can,
> 
> 1. Use t_relay and then in "send" event route remove the headers added by kamailio manually using textops module functions.
> 
> 2. Use send_data or sendx methods in corex module.
> 
> https://kamailio.org/docs/modules/5.5.x/modules/corex.html#corex.f.send_data
> 
> 3. Use "network:msg" route and shape the sip packet to the form acceptable by TCP box.
> 
> https://kamailio.org/docs/modules/5.5.x/modules/corex.html#corex.evr.network_msg
> 
> By the way, per my understanding send_tcp suppose to work for TLS connections, since TLS is basically a TCP connection. Anyways, i will run some tests to see its behavior when i have enough time.
> 
> --
> Muhammad Shahzad Shafi
> Tel: +49 176 99 83 10 85
> 
> 
> Sent from my Huawei P40 5G phone
> 
> 
> -------- Original message --------
> From: Ross McKillop <ross at rsmck.co.uk>
> Date: Fri, 12 Nov 2021, 14:44
> To: "Kamailio (SER) - Users Mailing List" <sr-users at lists.kamailio.org>
> Subject: [SR-Users] corex send()
> Hi All,
> 
> Is there an equivalent to corex's send_tcp (https://kamailio.org/docs/modules/5.2.x/modules/corex.html#corex.f.send_tcp <https://kamailio.org/docs/modules/5.2.x/modules/corex.html#corex.f.send_tcp>) for TLS? 
> 
> I have a bit of an odd edge case where I can't add Via headers etc, and send_udp and send_tcp allow me to achieve what I want, but it doesn't seem to have a means of doing the same with TLS? 
> 
> Essentially I want to transparently proxy what is received by Kamailio on one interface to a TLS connection e.g. 
> 
> 	A = (TCP) => Kamailio = (TLS) => Remote Host 
> 
> (A) in this instance is already setting a Via header of the Kamailio's external IP and transport tis. I appreciate this is a non-standard way of doing it, but (A) is a black box that I can't change, what I'm essentially trying to do is have Kamailio handle the TLS but essentially (A) thinks it's at the edge.
> 
> I can make it work with send_tcp for a standard TCP connection, but if I use t_relay or even forward() to send onwards by TLS then Kamailio obviously adds its own headers as you'd expect.
> 
> Ross

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