Cisco Unified Communication Trusted Firewall Control
Cisco Unified Communications Trusted Firewall Control pushes intelligent services onto the network through a Trusted Relay Point (TRP) firewall. Firewall traversal is accomplished using Session Traversal Utilities for NAT(STUN) on a TRP collocated with a Cisco Unified Communications Manager Express (Cisco Unified CME) or a Cisco Unified Border Element.
Prerequisites for Cisco Unified Communications Trusted Firewall Control
Cisco Unified Border Element
•Cisco IOS Release 12.4(22)T or a later release must be installed and running on your Cisco Unified Border Element.
Cisco Unified Border Element (Enterprise)
•Cisco IOS XE Release 3.3S or a later release must be installed and running on your Cisco ASR 1000 Series Router.
Configuring Cisco Unified Communication Trusted Firewall Control
Detailed commandinformation for the stun, stun flowdata agent-id, stun flowdata keepalive, stun flowdata shared-secret, stun usage firewall-traversal flowdata, voice-class stun-usage commands is located in the Cisco IOS Voice Command Reference.