Jabber login from public network not working

Hello all,
i am trying to register jabebr from public network with use of EXP-C and E.
but facing below error:

thanks fro your response to correct me with configuration.
1) Configuration as it pertains to the design on the Expressways
 i applied as per design and still open all ports between firewall for jabber.
2) Firewall blocking the UDP traffic.
if no rule define, how can it block and what need to configure for jabber with audio?
First question to you is are you using Single NIC or Dual NIC on the Expressway-E?
i am using single NIC.
If you are doing a Single NIC design and will have a private IP for the Expressway-E you must fulfill these 4 requirements
1)    Static NAT Mode Enabled on the IP Configuration page of the Exp-E
i will enable it on EXPE>.
2)    Static NAT Address Configured on the IP page of the Exp-E
what need to EXPE for this NAT option?
3)    Expressway-C must resolve the Expressway-E FQDN to the Public IP, not the private
if this is resolving private ip, would be any problem?
4)    NAT Reflection (Hairpinning) must be configured on the firewall so that traffic from the Expressway-C can be sent to the Expressway-E public IP and that can be redirected to the Expressway-E private IP. Please note not all firewalls support this functionality
please tell me how can enable NAT reflection on firewall to working it?
thanks

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