fix(proxy-engine): fix inbound route browser ringing and provider-facing SDP advertisement while preventing RTP port exhaustion

rust/crates/proxy-engine/src/sip_leg.rs

@@ -16,7 +16,6 @@ use sip_proto::helpers::{
 };
 use sip_proto::message::{RequestOptions, SipMessage};
 use std::net::SocketAddr;
-use std::sync::Arc;
 use tokio::net::UdpSocket;
 
 /// State of a SIP leg.
@@ -40,6 +39,9 @@ pub struct SipLegConfig {
     /// SIP target endpoint (provider outbound proxy or device address).
     pub sip_target: SocketAddr,
     /// Provider credentials (for 407 auth).
+    // username is carried for parity with the provider config but digest auth
+    // rebuilds the username from the registered AOR, so this slot is never read.
+    #[allow(dead_code)]
     pub username: Option<String>,
     pub password: Option<String>,
     pub registered_aor: Option<String>,
@@ -51,6 +53,10 @@ pub struct SipLegConfig {
 
 /// A SIP leg with full dialog management.
 pub struct SipLeg {
+    // Leg identity is tracked via the enclosing LegInfo's key in the call's
+    // leg map; SipLeg itself never reads this field back. Kept to preserve
+    // the (id, config) constructor shape used by the call manager.
+    #[allow(dead_code)]
     pub id: String,
     pub state: LegState,
     pub config: SipLegConfig,
@@ -411,11 +417,6 @@ impl SipLeg {
         dialog.terminate();
         Some(msg.serialize())
     }
-
-    /// Get the SIP Call-ID for routing.
-    pub fn sip_call_id(&self) -> Option<&str> {
-        self.dialog.as_ref().map(|d| d.call_id.as_str())
-    }
 }
 
 /// Actions produced by the SipLeg message handler.