diff --git a/pkg/db/media_server.go b/pkg/db/media_server.go
index e6cb67f..f2ca72e 100644
--- a/pkg/db/media_server.go
+++ b/pkg/db/media_server.go
@@ -58,6 +58,19 @@ func NewMediaServerDB(dbPath string) (*MediaServerDB, error) {
 	return &MediaServerDB{db: db}, nil
 }
 
+// GetMediaServerByNameAndIP 根据名称和IP查询媒体服务器
+func (m *MediaServerDB) GetMediaServerByNameAndIP(name, ip string) (*models.MediaServerResponse, error) {
+	var ms models.MediaServerResponse
+	err := m.db.QueryRow(`
+		SELECT id, name, type, ip, port, username, password, secret, is_default, created_at
+		FROM media_servers WHERE name = ? AND ip = ?
+	`, name, ip).Scan(&ms.ID, &ms.Name, &ms.Type, &ms.IP, &ms.Port, &ms.Username, &ms.Password, &ms.Secret, &ms.IsDefault, &ms.CreatedAt)
+	if err != nil {
+		return nil, err
+	}
+	return &ms, nil
+}
+
 func (m *MediaServerDB) AddMediaServer(name, serverType, ip string, port int, username, password, secret string, isDefault int) error {
 	_, err := m.db.Exec(`
 		INSERT INTO media_servers (name, type, ip, port, username, password, secret, is_default)
@@ -66,6 +79,24 @@ func (m *MediaServerDB) AddMediaServer(name, serverType, ip string, port int, us
 	return err
 }
 
+// AddOrUpdateMediaServer 添加或更新媒体服务器（如果已存在则更新）
+func (m *MediaServerDB) AddOrUpdateMediaServer(name, serverType, ip string, port int, username, password, secret string, isDefault int) error {
+	// 检查是否已存在
+	existing, err := m.GetMediaServerByNameAndIP(name, ip)
+	if err == nil && existing != nil {
+		// 已存在，更新记录
+		_, err = m.db.Exec(`
+			UPDATE media_servers
+			SET type = ?, port = ?, username = ?, password = ?, secret = ?, is_default = ?
+			WHERE name = ? AND ip = ?
+		`, serverType, port, username, password, secret, isDefault, name, ip)
+		return err
+	}
+
+	// 不存在，插入新记录
+	return m.AddMediaServer(name, serverType, ip, port, username, password, secret, isDefault)
+}
+
 func (m *MediaServerDB) DeleteMediaServer(id int) error {
 	_, err := m.db.Exec("DELETE FROM media_servers WHERE id = ?", id)
 	return err
diff --git a/pkg/db/media_server_test.go b/pkg/db/media_server_test.go
new file mode 100644
index 0000000..1d9fcdf
--- /dev/null
+++ b/pkg/db/media_server_test.go
@@ -0,0 +1,107 @@
+package db
+
+import (
+	"os"
+	"testing"
+)
+
+func TestAddOrUpdateMediaServer(t *testing.T) {
+	// 创建临时数据库文件
+	dbPath := "./test_media_servers.db"
+	defer os.Remove(dbPath)
+
+	// 创建数据库实例
+	db, err := NewMediaServerDB(dbPath)
+	if err != nil {
+		t.Fatalf("Failed to create database: %v", err)
+	}
+	defer db.Close()
+
+	// 测试第一次添加
+	err = db.AddOrUpdateMediaServer("Default", "SRS", "192.168.1.100", 1985, "", "", "", 1)
+	if err != nil {
+		t.Fatalf("Failed to add media server: %v", err)
+	}
+
+	// 验证添加成功
+	servers, err := db.ListMediaServers()
+	if err != nil {
+		t.Fatalf("Failed to list media servers: %v", err)
+	}
+	if len(servers) != 1 {
+		t.Fatalf("Expected 1 server, got %d", len(servers))
+	}
+	if servers[0].Name != "Default" || servers[0].IP != "192.168.1.100" {
+		t.Fatalf("Server data mismatch: %+v", servers[0])
+	}
+
+	// 测试重复添加（应该更新而不是插入新记录）
+	err = db.AddOrUpdateMediaServer("Default", "SRS", "192.168.1.100", 1985, "admin", "password", "secret", 1)
+	if err != nil {
+		t.Fatalf("Failed to update media server: %v", err)
+	}
+
+	// 验证没有重复记录
+	servers, err = db.ListMediaServers()
+	if err != nil {
+		t.Fatalf("Failed to list media servers: %v", err)
+	}
+	if len(servers) != 1 {
+		t.Fatalf("Expected 1 server after update, got %d", len(servers))
+	}
+	if servers[0].Username != "admin" || servers[0].Password != "password" {
+		t.Fatalf("Server update failed: %+v", servers[0])
+	}
+
+	// 测试多次调用（模拟容器重启）
+	for i := 0; i < 5; i++ {
+		err = db.AddOrUpdateMediaServer("Default", "SRS", "192.168.1.100", 1985, "", "", "", 1)
+		if err != nil {
+			t.Fatalf("Failed on iteration %d: %v", i, err)
+		}
+	}
+
+	// 验证仍然只有一条记录
+	servers, err = db.ListMediaServers()
+	if err != nil {
+		t.Fatalf("Failed to list media servers: %v", err)
+	}
+	if len(servers) != 1 {
+		t.Fatalf("Expected 1 server after multiple restarts, got %d", len(servers))
+	}
+
+	t.Log("Test passed: No duplicate servers created on restart")
+}
+
+func TestAddMediaServerDuplicates(t *testing.T) {
+	// 创建临时数据库文件
+	dbPath := "./test_media_servers_dup.db"
+	defer os.Remove(dbPath)
+
+	// 创建数据库实例
+	db, err := NewMediaServerDB(dbPath)
+	if err != nil {
+		t.Fatalf("Failed to create database: %v", err)
+	}
+	defer db.Close()
+
+	// 使用旧的 AddMediaServer 方法测试重复添加问题
+	for i := 0; i < 3; i++ {
+		err = db.AddMediaServer("Default", "SRS", "192.168.1.100", 1985, "", "", "", 1)
+		if err != nil {
+			t.Fatalf("Failed to add media server: %v", err)
+		}
+	}
+
+	// 验证会产生重复记录
+	servers, err := db.ListMediaServers()
+	if err != nil {
+		t.Fatalf("Failed to list media servers: %v", err)
+	}
+	if len(servers) != 3 {
+		t.Fatalf("Expected 3 duplicate servers with old method, got %d", len(servers))
+	}
+
+	t.Log("Test confirmed: Old AddMediaServer method creates duplicates")
+}
+
diff --git a/pkg/service/uas.go b/pkg/service/uas.go
index 9c79485..ace8f09 100644
--- a/pkg/service/uas.go
+++ b/pkg/service/uas.go
@@ -86,7 +86,7 @@ func (s *UAS) startSipServer(agent *sipgo.UserAgent, ctx context.Context, r0 int
 
 	candidate := os.Getenv("CANDIDATE")
 	if candidate != "" {
-		MediaDB.AddMediaServer("Default", "SRS", candidate, 1985, "", "", "", 1)
+		MediaDB.AddOrUpdateMediaServer("Default", "SRS", candidate, 1985, "", "", "", 1)
 	}
 	return nil
 }