D-Link DPH-120S manual Media Port, Prack, Session Refresher, Session Timer Method

7.9SIP Setting – Others

This section is for network administrators.

Session Timer	The time interval in which the phone periodically refresh
	SIP sessions by sending repeated INVITE requests. These
	INVITE requests allow the user agent or proxies to
	determine the status of the SIP session.
Media Port	Real-time Transport Protocol port number. Provides end-
	to-end transfer of data with real-time audio.
Prack	Prack ensures that media information is exchanged and
	that network checks before connecting the call. Select
	Enable for a more reliable connection.
Session Refresher	Select None to disable SIP session timer support.
	Select UAC to initiate SIP request.
	Select UAS to receive SIP request and then return a
	response.
Session Timer Method	Select SIP request method. Default method is Invite.
UDP/TCP	Select SIP signal transmission method. Default method is
	UDP.

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