The Expressway solution consists of:
An Expressway-E is located outside the firewall on the public network or in the DMZ, which acts as the firewall traversal server.
An Expressway-C or other traversal-enabled endpoint located in a private network acts as the firewall traversal client.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/admin_guide/X14-0/exwy_b_cisco-expressway-administrator-guide/exwy_m_firewall-traversal.html
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