Re: event_route[tcp:closed] and event_route[websocket:closed] not triggered on sudden WebSocket connection loss

Please show the PCAP recorded on the Kamailio side for traffic (connection)
from a mobile device.
With high probability, a TCP connection attempts to recover for 30 minutes.

Sergey

On Mon, Jul 14, 2025 at 3:15 PM fabien via sr-users <
[email protected]> wrote:

> Hello Kamailio community,
>
> I'm running Kamailio 5.8 with websocket and tcpops modules loaded.
>
> My setup:
> - websocket module configured with keepalive enabled:
>   modparam("websocket", "keepalive_mechanism", 1)
>   modparam("websocket", "keepalive_interval", 10)
>   modparam("websocket", "keepalive_timeout", 5)
>   modparam("websocket", "keepalive_processes", 2)
>   modparam("websocket", "timer_interval", 5)
>
> - tcpops module loaded with closed_event enabled:
>   loadmodule "tcpops.so"
>   modparam("tcpops", "closed_event", 1)
>
> - event_route[tcp:closed] implemented to catch socket closure and clean
> dialogs
> - dialog module loaded with dlg_flag = 4, and dialog tracking active on
> INVITE requests
>
> What works:
> - When I manually kill the WebSocket client, the event_route[tcp:closed]
> is triggered immediately.
>
> What doesn't work:
> - When the client loses network connectivity abruptly (e.g. mobile device
> loses 4G signal or Wi-Fi disconnects), the event_route[tcp:closed] is NOT
> triggered for several minutes (likely until TCP timeout).
> - I've tried reducing websocket keepalive_timeout to 5 seconds, but it
> does not speed up detection of lost connections.
> - I have confirmed that TCP keepalive settings on the OS are at default
> values and have not yet been tuned.
>
> My questions:
> 1. Is there any known limitation or delay in Kamailio's tcpops or
> websocket modules that could cause delayed detection of abrupt WebSocket
> disconnects?
> 2. Are there any best practices or additional mechanisms recommended to
> handle abrupt WebSocket disconnections faster, especially for SIP dialog
> cleanup?
> 3. Would adding SIP OPTIONS ping help detect dead clients sooner, and how
> would you recommend implementing this in Kamailio?
> 4. Any other suggestions to improve detection and cleanup of dead
> WebSocket SIP clients?
>
> Thanks in advance for your help and advice.
>
> Best regards,
> Fabien Brou
> __________________________________________________________
> Kamailio - Users Mailing List - Non Commercial Discussions --
> [email protected]
> To unsubscribe send an email to [email protected]
> Important: keep the mailing list in the recipients, do not reply only to
> the sender!
>

__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions -- [email protected]
To unsubscribe send an email to [email protected]
Important: keep the mailing list in the recipients, do not reply only to the sender!