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9da537a19f
Implement SIP 603+ (ATIS-1000099) support for FCC analytics-based call blocking compliance. Detection: - Detect incoming 603+ responses by checking "Network Blocked" phrase and "v=analytics1;" in the `Reason` header text - Set `sip_603plus_reason` channel variable on both legs for CDR visibility Passthrough control: - `sip_603plus_passthrough=true`: forward 603+ phrase and Reason header - `sip_603plus_passthrough=false`: strip `Reason` header, send clean `603 Decline` - Not set: existing behavior preserved - Works independently of `disable_q850_reason` for selective forwarding