Gateway Signaling

 General

SBC call flows consisting of SIP or H.323 on one leg and Gateway on the other exhibit the same performance and capacity metrics as pure SIP or H.323 calls.

 Preventing On-hold Race Condition for Gateway Calls

The SBC is enhanced with the addition of three gateway-specific signaling flags in the SIP trunk group signaling configuration to support the handling of 100rel-based back-to-back 18x responses using SDP changes to block irrelevant Re-INVITE/UPDATE messages between gateways. This configuration will prevent potential one-way audio issues between gateways.

• disableMediaLockDownAtGwSg
• minimizeRelayingOfMediaChangesAtGwSg
• relayDatapathModeChangesAtGwSg

Refer to the following pages for configuration details:

• SIP TG - Signaling - Disable Media Lockdown At GW Signaling - CLI
• SIP TG - Signaling - Minimize Relaying Media Changes At GW Signaling - CLI
• SIP TG - Signaling - Relay Data Path Mode Changes At GW Signaling - CLI
• SIP Trunk Group - Signaling (EMA)