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161 - 165 IP Telephony v1.0 TCP and UDP Port Numbers Copyright © 2005, Cisco Systems, Inc.
Protocol
Remote
Source
Port
CallManager
Destination
Port
CallManager
Source Port
Remote
Device
Destination
Port
Remote
Devices
Notes
H.323 H.245
TCP 11000-
65535
IOS H.323
Gateways.
Cisco
Conference
Connection
SCCP TCP 2000
Skinny Clients
(IP Phones)
Skinny
Gateway
(Analogue)
TCP 2001
Analogue
Skinny
Gateway
Obsolete
Skinny
Gateway
(Digital)
TCP 2002
Digital Skinny
Gateway
Obsolete
MGCP
Control
UDP 2427
MGCP
Gateway
Control
MGCP
Backhaul
TCP 2428
MGCP
Gateways
Backhaul
RTS Serv 2500
Cisco
Extended
Service
TCP 2551
Active /
Backup
Determination
Cisco
Extended
Service
TCP 2552
DB Change
Notification
RIS Data
Collector
TCP 2555
Inter RIS
communication
RIS Data
Collector
TCP 2556
Used by
clients (IIS) to
communicate
with RIS
CTI/QBE TCP 2748
TAPI/JTAPI
Applications
Connects with
CTI Manager.
Used by IVR,
CCC, PA,
Cisco
Softphone,
CRS, ICD,
IPCC, IPMA,
Attendant
Console and
any other
application that
utilizes the
TAPI or J/TAPI
plugin / TSP.
IPMA
Service
TCP 2912
IPMA
Assistant
Console
Media
Streaming
Application
UDP 3001
Change
Notification