[Users] OpenSER 1.2.1 resend of messages not matched in tm?

[Tobias Lindgren]

Hi all,

I'm running openser 1.2.1 w/ tm module. In some calls, specially
FAX-calls, my gateways tries T.38 first and then performs fallback to
G711. This scenario makes my OpenSER resend some messages even though it
has got an ACK.

What happends is that the terminating PBX doesn't support T.38 and sends
a "488 Not Acceptable Media" respons to my OpenSER which is relayed back
to my gateway. The relay of messages looks like this:
- INVITE with T.38 from GW to PBX
 1. PBX sends 488 to OpenSER
 2. OpenSER ACKs to PBX
 3. OpenSER sends 488 to GW
 4. GW ACKs to OpenSER
 5. OpenSER sends 488 to GW
 6. GW ACKs to OpenSER
- INVITE with G711 from GW to PBX
 1. PBX OK back to GW

Now after the new INVITE with G711 OpenSER starts to send the
488-messages to my Gateway again, and I'm assuming it does so because it
think they are not ACKed? Any idea to what goes wrong here?

Br,
/Tobias