Hello, In bypass-media mode freeswitch locally acks the 200 ok (SDP), that leads to some Race condition when the party that answered the 200 sends a quick reinvite after Just after the Ack. I tried on 1.10.1 and 1.10.5, with and without late-negociation, but couldn’t figure how to avoid this. Has one of you experienced it or have any idea about this ? SBC FREESWITCH PBX +--------- ----------+--------- ----------+ | INVITE (SDP) | | | --------------------------> | | | 100 Trying | | | <-------------------------- | | | | INVITE (SDP) | | | --------------------------> | | | 100 Trying | | | <-------------------------- | | | 180 Ringing | | | <-------------------------- | | 180 Ringing | | | <-------------------------- | | | | 200 OK (SDP) | | | <-------------------------- | | | ACK | | | --------------------------> | | 200 OK (SDP) | | | <-------------------------- | | | | INVITE (SDP) | | | <-------------------------- | | | 100 | | | --------------------------> | | INVITE (SDP) | | | <-------------------------- | | | 100 | | | --------------------------> | | | 491 | | | --------------------------> | | | | 491 | | | --------------------------> | Regards, David