B. Assent: This is a protocol used by Cisco Expressway for NAT traversal of media streams, allowing endpoints behind firewalls or NAT devices to communicate effectively through the Expressway.
D. H.460.18/19: These are extensions to the H.323 protocol that enable firewall and NAT traversal, allowing media and signaling to pass through the firewall when using H.323 endpoints.
It is correct. A and E.
The "far end" (at home or at a hotel, for example) endpoint requirements to support firewall traversal are summarized below:
For H.323, the endpoint needs to support Assent or H460.18 and H460.19.
For SIP, the endpoint just needs to support standard SIP.
The Expressway supports two different firewall traversal protocols for H.323: Assent and H.460.18/H.460.19.
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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