[Freeswitch-users] Instant message problem

Hello, I have a strange problem when trying to send IM messages between two clients that connected to FS. When not during call, I'm sending a MESSAGE with the IM string and it works well. But when the two clients are during call, I see in wireshark that the message is coming to FS, but not forwarded to the second client. There is nothing in the log file regarding this message. Is this a known bug? Thank you for helping, Kenneth.