Wednesday, October 11

Exchange 2007 UM ports

Unified Messaging - the new features in Exchange 2007. Take quite a while for me to find the following information. Just wish to share with those who are looking for it. This article is about TCP/UDP ports used.

NOTE: This info is plug from Microsoft Info:

UM Protocols and Services
Exchange 2007 Unified Messaging features and services rely on both static and dynamic TCP and UDP ports to ensure correct operation of the computer that is running the Unified Messaging server role.

Session Initiation Protocol (SIP) is a protocol that is used for initiating, modifying, and ending an interactive user session that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. It is one of the leading signaling protocols for Voice over IP (VoIP), together with H.323. Most VoIP standards-based solutions use either the H.323 or Session Initiation Protocol (SIP) protocols. The VoIP protocols typically support features such as call waiting, conference calling, and call transfer.

SIP clients such as IP/VoIP gateways and IP-PBXs can use TCP and UDP port 5060 to connect to SIP servers. SIP is only used in setting up and tearing down voice or video calls. All voice and video communications occur over RTP.

Real-time Transport Protocol (RTP) defines a standard packet format for delivering audio and video over a given network, such as the Internet. RTP only carries voice/video data over the network. Call setup and tear-down are generally performed by the SIP protocol.

RTP does not require a standard or static TCP or UDP port to communicate with. RTP communications occur on an even UDP port, and the next higher odd port is used for TCP communications. Although there are no standard port range assignments, RTP is generally configured to use ports 16384-32767. It is difficult for RTP to traverse firewalls because it uses a dynamic port range.

T.38 is a faxing standard and protocol that enables faxing over an IP-based network. The IP-based network then uses SMTP and MIME to send the message to a recipient's mailbox. T.38 allows for IP fax transmissions for IP-enabled fax devices and fax gateways. The devices can include IP network-based hosts such as client computers and printers. In Exchange 2007 Unified Messaging, the fax images are separate documents encoded as TIFF images and attached to an e-mail message. Both the e-mail message and the TIFF attachment are sent to the recipient's Exchange 2007 UM-enabled mailbox.

UM Web Services
The UM Web Services installed on a computer that is running Exchange 2007 that has the Client Access server role installed use IP for network communication between a client, the UM server, the Client Access server, and computers that are running other Exchange 2007 server roles. There are several Exchange 2007 Outlook Web Access and Microsoft Office Outlook 2007 client features that rely on the UM Web service to operate correctly.

The Unified Messaging client features that rely on the UM Web Service are as follows:

The voice mail options that are available with Exchange 2007 Outlook Web Access, including the Play on Phone feature and the ability to reset a PIN.

The Play on Phone feature found in the Outlook 2007 client.

When an organization uses the Play on Phone and other client features in Exchange 2007 Unified Messaging, a computer that is running the Client Access, Hub Transport, and Mailbox server roles within the same Active Directory site is required in addition to the computer or computers that have the Unified Messaging server role installed.

Port Assignments
Table 1 shows the IP ports that Unified Messaging uses for each protocol and whether the IP ports that are used for each protocol can be changed.

SIP - UM Service

Ports are hard-coded and cannot be set by using the XML configuration file.

SIP - Worker Process
5061 and 5062

Ports are set by using the XML configuration file.


Port range above 1024
The range of ports can be changed in the registry.


Dynamic port above 1024
Ports are defined by the system.

UM Web service
Dynamic port above 1024


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