[Freeswitch-users] Freeswitch loacally acks 200 in bypass media scenarios

[David VILLAUME]

I mean that freeswitch sends the Ack on the Bleg,  before propagating to the 200 to the A leg.

I would imagine in a bypass media scenario the Ack would handle the 200 with SDP as a proxy, am I wrong about it ?

Regards,
David

From: FreeSWITCH-users <freeswitch-users-bounces at lists.freeswitch.org> On Behalf Of Brian West
Sent: Thursday, March 4, 2021 8:39 PM
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
Subject: Re: [Freeswitch-users] Freeswitch loacally acks 200 in bypass media scenarios

What do you mean 'locally acks'?

On Thu, Mar 4, 2021 at 1:25 PM David VILLAUME <david.villaume at sewan.fr<mailto:david.villaume at sewan.fr>> wrote:
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
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