Hi,

I am using Kamailio 5.2. 

Apparently the remapping of 503 to 500 codes in the tm module does also change 
the to-tag. This behaviour breaks dialogs with yate and therefore calls hang 
and the 503 remains unacknowledged. After disabling the 503 to 500 remapping 
with modparam("tm", "remap_503_500", 0) all works fine again.

Changing the to-tag in a dialog seems to contradict RFC3261, or do I see this 
wrongly?
12 <https://tools.ietf.org/html/rfc3261#section-12> Dialogs

A dialog is identified at each UA with a dialog ID, which consists of a Call-ID 
value, a local tag and a remote tag…"


Thanks for looking into this.

Gerry

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