Integration requirements

To establish a communications link between Messaging and your telephony server, you must ensure that certain parameters for each application role match the equivalent parameters on the telephony server.

Messaging supports the T.38 codec for receiving faxes. Ensure that the telephony server uses the T.38 fax codec for fax calls that route to Messaging.

Telephony parameters

Before you begin setting parameters on the Telephony Integration Web page, gather information about the following settings from the telephony server:

Call Control Per Hop Behavior (PHB) and Audio PHB. This information is only relevant if your IP network infrastructure supports the Quality of Service (QoS) features.
The transport method.
The IP address and port number of each far-end connection, that is, the SIP proxy server.
Domain name: The domain names must match for the application server, the telephony server, System Manager, and SIP Enablement Services.
The number of messaging trunks.
(Optional) The type of Secure Real-time Transport Protocol (SRTP) media encryption.

Network parameters

You also need the following information for each application server:

The port number, usually 5060 for TCP transport or 5061 for TLS transport.
The domain name.