Datasheet

Cisco Preferred Architecture for
Midmarket Collaboration PAGE 27
Collaboration Edge
Figure 13. Traversal for Registrations Through Firewall with Expressway-C and Expressway-E
Figure 14. Traversal for Business-to-Business Calls Through Firewall with Expressway-C and Expressway-E
Cisco Expressway-C
Place Expressway-C in the trusted network inside the organization. Deploy Expressway-C to:
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Function as a traversal client and establish a secure connection to Expressway-E through the firewall
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Establish secure or non-secure connection to Cisco Unified CM
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Integrate with an existing internal video network that uses H.323
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Enable business-to-business calls to external entities that communicate using SIP or H.323
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Provide interworking between H.323 and SIP protocols for H.323 business-to-business communications
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Enable mobile and remote access capabilities and call signaling for Cisco-supported endpoints, directing them to
Cisco Unified CM for SIP registration and/or the IM and Presence Service (See the Endpoints section for
information on which endpoints support mobile and remote access.)