feat(routing): require explicit inbound DID routes and normalize SIP identities for provider-based number matching

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

@@ -63,7 +63,8 @@ pub fn spawn_sip_inbound(
                         if offset + 4 > n {
                             continue; // Malformed: extension header truncated.
                         }
-                        let ext_len = u16::from_be_bytes([buf[offset + 2], buf[offset + 3]]) as usize;
+                        let ext_len =
+                            u16::from_be_bytes([buf[offset + 2], buf[offset + 3]]) as usize;
                         offset += 4 + ext_len * 4;
                     }
                     if offset >= n {
@@ -74,7 +75,17 @@ pub fn spawn_sip_inbound(
                     if payload.is_empty() {
                         continue;
                     }
-                    if inbound_tx.send(RtpPacket { payload, payload_type: pt, marker, seq, timestamp }).await.is_err() {
+                    if inbound_tx
+                        .send(RtpPacket {
+                            payload,
+                            payload_type: pt,
+                            marker,
+                            seq,
+                            timestamp,
+                        })
+                        .await
+                        .is_err()
+                    {
                         break; // Channel closed — leg removed.
                     }
                 }