### 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.
Thanks for the report. So you are saying that the $rs is not working for locally generated replies (e.g. the 408) in the dialog:failued route in all cases or only when you use TCP transport?
The $rs is for incoming SIP reply processing, no relation with tm or dialog module and I would keep it like that.
If event_route[dialog:failed] happens in the context of transmission error and the transaction fails, then you should be able to use $T(reply_code). So it should provide what you look for in this particular case.
Otherwise, event_route[dialog:failed] can be also executed with an internal faked msg, if it happens to be executed when no SIP traffic is handled.
You can eventually add a new attribute for $dlg_ctx():
* https://www.kamailio.org/wiki/cookbooks/5.5.x/pseudovariables#dlg_ctx_attr
And you set its value based on whether a reply was received from the network, transaction failed and value of $T(reply_code) should be used, etc.
Closed #2867 as completed.
Closing it due to long inactivity time. A PR can be made if someone decides to implement it.
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Daniel-Constantin Mierla -
Henning Westerholt
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sergey-safarov