diff --git a/src/Center/CenterSessionManager.ts b/src/Center/CenterSessionManager.ts
index d828562..82ec8bd 100644
--- a/src/Center/CenterSessionManager.ts
+++ b/src/Center/CenterSessionManager.ts
@@ -9,6 +9,8 @@ import {Center} from "./Center";
 const CENTER_SESSIONS_FILE: string = process.env.CENTER_SESSIONS_FILE || "center_sessions.json";
 
 export class CenterSessionManager extends SessionManager {
+    comparatorFn: (arg: any, session: SmppSession) => boolean = (arg: any, session: SmppSession) => (session as Center).getPort() === arg;
+    StorageFile: string = CENTER_SESSIONS_FILE
 	ManagedSessionClass: any = Center;
 	sessionId: number = 0;
 	sessions: Center[] = [];
@@ -21,29 +23,6 @@ export class CenterSessionManager extends SessionManager {
 		// super.eventEmitter.on(super.SESSION_ADDED_EVENT, (session: SmppSession) => this.eventEmitter.emit(this.SESSION_ADDED_EVENT, session));
 	}
 
-	setup(): void {
-		try {
-			this.logger.log1(`Loading clients from ${CENTER_SESSIONS_FILE}`)
-			let sessions: Buffer = fs.readFileSync(CENTER_SESSIONS_FILE);
-			let loadedSessions: any[] = JSON.parse(String(sessions));
-			this.logger.log1(`Loaded ${loadedSessions.length} clients from ${CENTER_SESSIONS_FILE}`);
-			loadedSessions.forEach(session => {
-				this.createSession(session.url, session.username, session.password).then((sessionObj: SmppSession) => {
-					sessionObj.setDefaultSingleJob(Job.deserialize(session.defaultSingleJob));
-					sessionObj.setDefaultMultipleJob(Job.deserialize(session.defaultMultipleJob));
-				});
-			});
-		} catch (e) {
-			this.logger.log1(`Error loading clients from ${CENTER_SESSIONS_FILE}: ${e}`);
-			return;
-		}
-	}
-
-	cleanup(): void {
-		this.logger.log1(`Saving clients to ${CENTER_SESSIONS_FILE}...`);
-		fs.writeFileSync(CENTER_SESSIONS_FILE, JSON.stringify(this.serialize(), null, 4));
-	}
-
 	createSession(port: number, username: string, password: string): Promise<SmppSession> {
 		return new Promise<SmppSession>((resolve, reject) => {
 			this.logger.log1(`Creating session with port ${port}`);
diff --git a/src/Client/ClientSessionManager.ts b/src/Client/ClientSessionManager.ts
index 5747de6..fee3ec1 100644
--- a/src/Client/ClientSessionManager.ts
+++ b/src/Client/ClientSessionManager.ts
@@ -1,4 +1,5 @@
 import EventEmitter from "events";
+import {Center} from "../Center/Center";
 import Logger from "../Logger";
 import {SessionManager} from "../SessionManager";
 import {SmppSession} from "../SmppSession";
@@ -7,6 +8,8 @@ import {Client} from "./Client";
 const CLIENT_SESSIONS_FILE: string = process.env.CLIENT_SESSIONS_FILE || "client_sessions.json";
 
 export default class ClientSessionManager extends SessionManager {
+    comparatorFn: (arg: any, session: SmppSession) => boolean = (arg: any, session: SmppSession) => (session as Client).getUrl() === arg;
+	StorageFile: string = CLIENT_SESSIONS_FILE;
 	ManagedSessionClass: any = Client;
 	sessionId: number = 0;
 	sessions: Client[] = [];
@@ -20,29 +23,6 @@ export default class ClientSessionManager extends SessionManager {
 		// super.eventEmitter.on(super.SESSION_ADDED_EVENT, (session: SmppSession) => this.eventEmitter.emit(this.SESSION_ADDED_EVENT, session));
 	}
 
-	// TODO: Move this to superclass too
-	getExisting(arg: any): Promise<SmppSession> {
-		return new Promise<SmppSession>((resolve, reject) => {
-			this.logger.log1(`Looking for session with url ${arg}...`);
-			let session: SmppSession | undefined = this.sessions.find((s: Client) => s.getUrl() === arg);
-			if (session) {
-				this.logger.log1(`Found session with url ${arg}`);
-				resolve(session);
-			} else {
-				this.logger.log1(`Session with url ${arg} not found`);
-				reject(`Session with url ${arg} not found`);
-			}
-		});
-	}
-
-	cleanup(): void {
-		throw new Error("Method not implemented.");
-	}
-
-	setup(): void {
-		throw new Error("Method not implemented.");
-	}
-
 	// setup(): void {
 	// 	try {
 	// 		this.logger.log1(`Loading clients from ${CLIENT_SESSIONS_FILE}`)
diff --git a/src/SessionManager.ts b/src/SessionManager.ts
index 55cd327..6c93032 100644
--- a/src/SessionManager.ts
+++ b/src/SessionManager.ts
@@ -1,12 +1,17 @@
 import EventEmitter from "events";
+import fs from "fs";
+import {Client} from "./Client/Client";
+import {Job} from "./Job/Job";
 import Logger from "./Logger";
 import {SmppSession} from "./SmppSession";
 
 export abstract class SessionManager {
 	abstract sessions: SmppSession[];
 	abstract sessionId: number;
+	abstract comparatorFn: (arg: any, session: SmppSession) => boolean;
 	readonly abstract identifier: string;
 	readonly abstract ManagedSessionClass: any;
+	readonly abstract StorageFile: string;
 
 	readonly SESSION_ADDED_EVENT: string = "SESSION ADDED";
 	readonly logger: Logger = new Logger("SessionManager");
@@ -86,9 +91,40 @@ export abstract class SessionManager {
 		}
 	}
 
-	abstract cleanup(): void;
+	setup(): void {
+		try {
+			this.logger.log1(`Loading ${this.ManagedSessionClass.name} from ${this.StorageFile}`)
+			let sessions: Buffer = fs.readFileSync(this.StorageFile);
+			let loadedSessions: any[] = JSON.parse(String(sessions));
+			this.logger.log1(`Loaded ${loadedSessions.length} clients from ${this.StorageFile}`);
+			loadedSessions.forEach(session => {
+				this.createSession(session.url, session.username, session.password).then((sessionObj: SmppSession) => {
+					sessionObj.setDefaultSingleJob(Job.deserialize(session.defaultSingleJob));
+					sessionObj.setDefaultMultipleJob(Job.deserialize(session.defaultMultipleJob));
+				});
+			});
+		} catch (e) {
+			this.logger.log1(`Error loading centers from ${this.StorageFile}: ${e}`);
+			return;
+		}
+	}
 
-	abstract setup(): void;
-
-	abstract getExisting(arg: any): Promise<SmppSession>;
+	cleanup(): void {
+		this.logger.log1(`Saving centers to ${this.StorageFile}...`);
+		fs.writeFileSync(this.StorageFile, JSON.stringify(this.serialize(), null, 4));
+	}
+	getExisting(arg: any): Promise<SmppSession> {
+		return new Promise<SmppSession>((resolve, reject) => {
+			this.logger.log1(`Looking for session with url ${arg}...`);
+			// let session: SmppSession | undefined = this.sessions.find((s: Client) => s.getUrl() === arg);
+			let session: SmppSession | undefined = this.sessions.find(this.comparatorFn.bind(this, arg));
+			if (session) {
+				this.logger.log1(`Found session with url ${arg}`);
+				resolve(session);
+			} else {
+				this.logger.log1(`Session with url ${arg} not found`);
+				reject(`Session with url ${arg} not found`);
+			}
+		});
+	}
 }
\ No newline at end of file