Expressway

1. Expressway-C
2. Expressway-E
3. Redundancy
4. Mobile and remote access (MRA)

Expressway-C

• core
• manual endpoint config for SIP registration
• bridge between SIP and H.323, between IPv4 and IPv6

Expressway-E

• edge
• SIP TURN implementation
• multiplexes flows into single session
• 2 ports on FW: RTP and RTCP

Redundancy

• cluster, up to 6 nodes
• RTT 30 ms
• master – RW, slaves – RO

Mobile and remote access (MRA)

• register on CUCM through Expressway – no VPN required
• SIP only
• DNS SRV: points to Expressway-E
  • _collab-edge._tls.<domain>
  • secure SIP: _sips._tcp.<domain>
• _cisco-uds._tcp.<domain> is resolved ≡ internal network, point to CUCM