You should create two traversal server zones on VCS Expressway, and one traversal client zone per VCS Control. In other words, you should have one traversal link per VCS-C connecting VCS-E separately. Please make sure to configure different H.323/SIP port on each VCS-C. For example: VCS-C1 (headquarter): traversal client zone pointing to VCS-E with 6001 as H323 port and 7001 as SIP traversal port. VCS-C2 (branch office): traversal client zone pointing to VCS-E with 6002 as H323 port and 7002 as SIP traversal port. VCS-E: one traversal server zone listing for VCS-C1 (6001 as H323 port and 7001 as SIP traversal port) and other traversal server zone listing for VCS-C2 (6002 as H323 port and 7002 as SIP traversal port) ... View more