Hi Дилян,

This is a rather confusing topic in Kamailio.

Yes, t_relay() creates a transaction, provided that the t_relay() call is not 
unsuccessful "a priori" (e.g. due to invalid transport, DNS failure, lack of 
suitable sending listener, etc).

To create a transaction atomically generally means that the transaction is both 
created and utilised as a single operation.

-- Alex

> On Jan 20, 2023, at 8:41 AM, Дилян Палаузов <[email protected]> wrote:
> 
> Hello,
> 
> the documentation for tm.t_newtran() says „This is the only way a script can 
> add a new transaction in an atomic way.“  Moreover tm.t_send_reply()
> “creates the transaction if it does not exist (executing internally 
> t_newtran()) and sends a stateful reply (executing internally t_reply())”.  
> This
> means that only t_newtrans() and t_send_reply() can create transactions in an 
> atomic way.
> 
> The documentation of tm.t_relay() does not say whether the function creates a 
> transaction.  It also does not say what happens if t_reply() is not
> called after t_newtrans().
> 
> But for tm.t_set_retr() and tm.t_set_retr() is written “If the transaction is 
> already created (e.g called after t_relay() or in an onreply_route) …” 
> This suggests that tm.t_relay() does create atomically or not-atomically a 
> transaction.
> 
> - What does it mean to create a transaction in a non-atomic way?
> - Does tm.t_relay() create a transaction?
> 
> Greetings
>  Dilyan
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-- 
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800

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