[OpenSIPS-Users] (no subject)

[Alex R.S.M]

Hi,

Can openSIPS reply with an ACK to 200OK response for INVITE request? 
If it can, what function can generate ACK message?
Apparently both t_reply() and sl_send_reply() functions generate response message and not an ACK.
                                  
  UAC                 Proxy              UAS
   |    INVITE          |                 |
   |------------------->|                 |
   |    100 Trying      |                 |
   |<-------------------|     INVITE      |
   |                    |---------------->|
   |                    |   180 Ringing   |
   |                    |<----------------|
   |     180 Ringing    |                 |
   |<-------------------|                 |
   |                    |     200 OK      |
   |                    |<----------------|
   |                    |      ACK        |
   |                    |---------------->|
   |      200 OK        |                 |
   |<-------------------|                 |

Thanks,
Alex

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