Hi all,

Is there any way of catching these errors before sending a 500 No error (2/SL) ?

Thanks

On Tue, Oct 5, 2021 at 5:01 PM Marrold kamailio@marrold.co.uk wrote:

Hi Arsen

That looks perfect, except we're still using 4.3.X on some of our proxies ( I should have mentioned, sorry) . We plan on upgrading very soon...

Thanks

On Tue, Oct 5, 2021 at 4:58 PM Arsen Semenov arsperger@gmail.com wrote:

...

Hi, have you tried this param?

https://kamailio.org/docs/modules/devel/modules/usrloc.html#usrloc.p.db_clea...

On Tue, Oct 5, 2021 at 8:49 PM Marrold kamailio@marrold.co.uk wrote:

...

Hi,

We're currently implementing WebRTC (SIP over a websocket) on our Kamailio proxies and we're experiencing a minor issue after a restart.

We write all USRLOC entries to a shared database to implement HA. These are then loaded on a restart, which leaves us with entries with TCP connections that no longer exist. When a call attempt is made the proxy can't find the connection ID and immediately rejects the call with a "500 No error (2/SL)" -

Oct 5 15:38:24 proxy-01 /sbin/kamailio[32087]: WARNING: <core> [core/msg_translator.c:2861]: via_builder(): TCP/TLS connection (id: 0) for WebSocket could not be found Oct 5 15:38:24 proxy-01 /sbin/kamailio[32087]: ERROR: <core> [core/msg_translator.c:2038]: build_req_buf_from_sip_req(): could not create Via header Oct 5 15:38:24 proxy-01 /sbin/kamailio[32087]: ERROR: tm [t_fwd.c:479]: prepare_new_uac(): could not build request Oct 5 15:38:24 proxy-01 /sbin/kamailio[32087]: ERROR: tm [t_fwd.c:1759]: t_forward_nonack(): failure to add branches Oct 5 15:38:24 proxy-01 /sbin/kamailio[32087]: ERROR: sl [sl_funcs.c:414]: sl_reply_error(): stateless error reply used: No error (2/SL)

How can we catch this error to avoid terminating the call prematurely? Or should we flush these TCP connections on start up?

Thanks Matthew

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That makes sense, thanks Arsen. We're already catching it then we just sl_reply_error() - I'll add some special handling for this scenario

Thanks again

On Wed, Oct 20, 2021 at 12:58 PM Arsen Semenov arsperger@gmail.com wrote:

Hi,

Yes, you can handle return codes from t_relay(). It should return -1 in case of network failure.

On Wed, 20 Oct 2021 at 4:39 PM, Marrold kamailio@marrold.co.uk wrote:

...

Hi all,

Is there any way of catching these errors before sending a 500 No error (2/SL) ?

Thanks

On Tue, Oct 5, 2021 at 5:01 PM Marrold kamailio@marrold.co.uk wrote:

...

Hi Arsen

That looks perfect, except we're still using 4.3.X on some of our proxies ( I should have mentioned, sorry) . We plan on upgrading very soon...

Thanks

On Tue, Oct 5, 2021 at 4:58 PM Arsen Semenov arsperger@gmail.com wrote:

...

Hi, have you tried this param?

https://kamailio.org/docs/modules/devel/modules/usrloc.html#usrloc.p.db_clea...

On Tue, Oct 5, 2021 at 8:49 PM Marrold kamailio@marrold.co.uk wrote:

...

Hi,

We're currently implementing WebRTC (SIP over a websocket) on our Kamailio proxies and we're experiencing a minor issue after a restart.

We write all USRLOC entries to a shared database to implement HA. These are then loaded on a restart, which leaves us with entries with TCP connections that no longer exist. When a call attempt is made the proxy can't find the connection ID and immediately rejects the call with a "500 No error (2/SL)" -

Oct 5 15:38:24 proxy-01 /sbin/kamailio[32087]: WARNING: <core> [core/msg_translator.c:2861]: via_builder(): TCP/TLS connection (id: 0) for WebSocket could not be found Oct 5 15:38:24 proxy-01 /sbin/kamailio[32087]: ERROR: <core> [core/msg_translator.c:2038]: build_req_buf_from_sip_req(): could not create Via header Oct 5 15:38:24 proxy-01 /sbin/kamailio[32087]: ERROR: tm [t_fwd.c:479]: prepare_new_uac(): could not build request Oct 5 15:38:24 proxy-01 /sbin/kamailio[32087]: ERROR: tm [t_fwd.c:1759]: t_forward_nonack(): failure to add branches Oct 5 15:38:24 proxy-01 /sbin/kamailio[32087]: ERROR: sl [sl_funcs.c:414]: sl_reply_error(): stateless error reply used: No error (2/SL)

How can we catch this error to avoid terminating the call prematurely? Or should we flush these TCP connections on start up?

Thanks Matthew

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