I have a problem with a customer: Freeswitch doesn't reply to all RE-INVITE (and all calls are dropped by customer switch after 180s for this reason).

At RE-INVITE reception Freeswitch reply with a 100 Trying and never send a 200 OK.

I have compared INVITE and RE-INVITE and to me seem to be ok, for example:

INVITE:
Call-ID: 26100859-3498991521-863759@SBC2.mydomain.com

REINVITE:
Call-ID: 26100859-3498991521-863759@SBC2.mydomain.com

INVITE
Via: SIP/2.0/UDP 192.168.1.4:5060;branch=z9hG4bK44ee87fffd4e657f4514fdad9de39f9e

RE-INVITE
Via: SIP/2.0/UDP 192.168.1.4:5060;branch=z9hG4bK0ed216868c20ca374c8893a4fb9a39b0

I have pastebin the captured packets: http://pastebin.freeswitch.org/14527

Can anyone help me?
I'm using Freeswitch GIT commit 97c65a004ee9e9b88dad7ff4ac1b2ec893b8c5ba, Date Nov 15 2010

Thanks in advance,

Stephen