1 Oct
2021
1 Oct
'21
5:48 p.m.
### Description
I use TCP transport to relay SIP messages.
When Kamailio cannot connect to another server then Kamailio generates response `408
Request Timeout`.
inside `event_route[dialog:failed]` route block I check error code `$rs` but this value is
`null`.
This happens because Kamailio does not able to relay SIP messages and is not able to
receive responses.
But `tm` module generates a response `408 Request Timeout` and will be fine to init `$rs`
pseudo-variable using tm module response.
### Expected behavior
`$rs` pseudo-variable contains `tm` module response when kamailio does not receive a
response from another server.
#### Actual observed behavior
`$rs` pseudo-variable contains `null` value when kamailio does not receive a response from
another server.
To check you can use
```
event_route[dialog:failed]
{
$var(code_xxx) = $(rs{re.subst,/([0-9])[0-9]{2}/\1xx/});
xlog("L_INFO", "websocket|log|dialog failed $rs;
$var(code_xxx)\n");
}
```
And relay SIP message to host that reachable.
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