Try here

https://www.kamailio.org/docs/modules/5.6.x/modules/tm.html#tm.e.local-request

However I would doubt first do I do something right by adding contact to ACK message wichbasicaly confirmation of the final transaction and contact here is meaningless.

On Sun, 7 May 2023, 16:48 mohsen khashei, <mkhashei@gmail.com> wrote:

Hi I want to know where kamailio sends ack messages to faiurel messages (status >=400) so that I I add Contact header to the ack.

I tried WITHINDLG with no luck.

thanks

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