However, If I set the VCS Exrepssway's private IP as the peer of VCS Control's traversal zone, sip can successful activated on both VCS C and VCS E. In this case, I see the Response-code="200" and Response-code="401" in the log.
Anyone know what does Response-code="503" measn in VCS E, any document explained the response code?
VCS E to VCS C traversal zone issue Response-code="503"
this can happen if the VCS-E is not aware of its public NAT address when it receives an OPTIONS ping destined for this public NAT address. Have you installed the 'Dual network interfaces' option key and configured static NAT on the VCS-E?
With this setup, with the dual NIC option key installed, on the IP settings page on the VCS-E, you should configure 'IPv4 static NAT mode' to 'On' and IPv4 static NAT address' to '18.104.22.168' on the interface which is NAT'ed.
Please refer to 'Appendix 4 - Static NAT and Dual Network Interface architectures' in the following document for guidelines on how to set this up:
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