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Technical Reference: Cisco Contact Center Product Port Utilization Guide

CTI Server

Side A: 

TCP 42027

Side B: 
TCP 43027

CTI OS Toolkit Clients, 

ARM Interface, CTI OS 

server, CAD 4.6 (and 

below Clients and 

servers

Additional instances 
will cause this port 
number to change 
(configurable). 

For more 
information, see 

CTI OS Server

TCP 42028

CTI OS Client

CTI OS Clients 
include Softphones, 
Siebel Driver & 
Custom Apps 

CTI OS server Peers

CTI OS Supervisor 
Desktop

UDP 8500

CTI OS Client

CTIOS 5.1

UDP 39200

CTI OS Client

CTIOS 5.1 SR1 and 
above

Cisco Enterprise 
Data Store 

TCP 42029

Siebel server

Support for screen 
call context

Chat

TCP 59020

Cisco Desktop Chat 

Service

Desktop 
Monitoring

TCP 59002

Cisco Supervisor 

Desktop, Cisco Desktop 

RASCAL Service

CAD 4.6 and higher 
only

Chat

TCP 59021

Cisco Desktop Chat 

Service

RTP streams

UDP 59010
UDP 59012

Cisco Desktop VoIP 

Monitor Service

Cisco Agent Desktop

CAD 4.6 and higher 
only

Cisco ICM/IP Contact Center Enterprise and Hosted Editions Port Utilization (Continued)