Hello,

what's in kamailio memory related to a tcp connection may not be its actual state, because the kernel/tcp stack can be in reconnecting state without notifying the application layer. It can take up to a few minutes to get to timeout and report connection is closed. So I am not sure you can avoid send failure in t_relay(), and thus overall benefits could be minimal.

Anyhow, look at the tcpops module, there is a function to get connection id by peer address/port, which you can get with next-hop variable before t_relay() (provided is not going to be fqdn, which may require mixing in ipops module).

An alternative, if you need it for requests within dialog, you can use hash table to store the connection ID using call-id as key when processing the initial subscribe/invite, then you can retrieve it for bye/notify/...

Cheers,
Daniel

On 02.11.20 19:04, Sergiu Pojoga wrote:
Hi Daniel,

In my case it's for an edge proxy scenario doing transport conversion, UDP backend to TCP/TLS client. So it would be after loose_route() followed by t_relay(). The initial TCP connection is established when a phone SUBSCRIBEs, later on the backend sends the in-dialog NOTIFY which often fails because the client & TCP connection is gone by now, causing a t_relay() failure.

Thanks. Regards,
--Sergiu

On Mon, Nov 2, 2020 at 12:29 PM Daniel-Constantin Mierla <miconda@gmail.com> wrote:

Hello,

do you need it in a generic way, or after some specific operations like lookup("location")?

Cheers,
Daniel

On 01.11.20 16:45, Sergiu Pojoga wrote:
Hi there,

Is there a PV that exposes the outgoing TCP connection ID? $conid seems to be for received only.

$conid - The TCP connection ID of the connection the current message arrived on for TCP, TLS, WS, and WSS. Set to $null for SCTP and UDP.

The objective is to check the status of the egress TCP connection like for e.g.:
if(!tcp_conid_state(conid)) {

Thanks.
--Sergiu

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_______________________________________________
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-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Funding: https://www.paypal.me/dcmierla