During a STUN connectivity check phase, the SBC prioritizes the processing of STUN packets that match the source addresses received in the candidate lines of the ICE SDP received from the peer. The Source Address Filtering mechanism for ICE is enabled by default. The filtering mechanism applies to the following address types: When the ICE Source Address Filtering is enabled, STUN packets that are received during the connectivity check phase and do not match the addresses sent by the peer are still processed but at a reduced rate. This allows learning Peer Reflexive Candidates through STUN. This has no impact during the stable call when only packets received from the learned source address are processed, and the rest are dropped by default. On SBC main screen, go to All > Address Context > Zone > SIP Trunk Group > Services > NAT Traversal > Ice Source Address Filter Priority. The Ice Source Address Filter Priority can be checked for each Address Context, for each Zone, for each Sip Trunk Group created or for all the Address Contexts, Zones and Sip Trunk Groups created. Use the drop-down box to select the desired Address Context, Zone and Sip Trunk Group. The Edit Ice Source Address Filter Priority window is displayed. Nat Traversal - Ice Source Address Filter Priority Ice parameters Parameter Description Specifies the administrative state of the ICE-related source address filtering mechanism. The options are:
To View and Edit Ice Source Address Filter Priority
State Server Reflexive Prefix Length Specifies the prefix's length (in bits) for the server reflexive IP address. The value ranges from 0 to 32, and the default value is 16.
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