Front End Server Properties: Telephony Conferencing

Use this tab to configure the listening address and port for audio conferencing provider (ACP) integration.

Note: The Telephony Conferencing Server does not support mixing Voice over IP (VoIP) and public switched telephone network (PSTN) in the same call.


The IP address and port on which the Front End Server receives messages related to phone conferencing.

IP address

The IP address that is associated with the Telephony Conferencing component of the Front End Server. The default is All, which we recommend if IP addresses in your environment are assigned dynamically or if your environment will use the fully qualified domain name (FQDN) to refer to the server instead. To refer to the server by using a single, specific IP address, click IP address, and then click the IP address that you want to use.

SIP listening port

The port on which the Telephony Conferencing component of the Front End Server receives Session Initiation Protocol (SIP) signaling messages.

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The Telephony Conferencing component of the Front End Server manages multiparty conferences in which phone users on the PSTN use a third-party audio conferencing provider for audio. During installation, the Front End Server is configured with default settings for the Telephony Conferencing component. If you change the settings, ensure that the settings you choose do not conflict with settings for other Office Communications Server components that are running on the same computer.

For details, see the Operations section of the Office Communications Server Technical Library.

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