D-Link VOIP TA DVG-5112S - Manual (Page 21)

DVG-5112S User’s Manual
D-Link Systems, Inc. 21
3-7 SIP Advanced
Listen Port UDP: It is not necessary to change the protocol of the communication port used by the
gateway, unless it conflicts with ports used by another device in your network.
RTP Starting Port UDP: The initial value of the port number for transmitting voice data among
gateway(s). Each line requires 2 ports. For the DVG-5112S gateway 4 UDP ports are required. It is not
necessary to change the setting, unless it conflicts with ports used by another network device.
For example, if the starting port is 9000, then Line 1 is using ports 9000 and 9001, and Line 2 is using
ports 9002 and 9003.
Session Timer
Session Expiration: This variable is used to avoid billing for abnormally dropped calls due to Internet
problems. The default is disabled.
Session Refresh Request: Used to resend UPDATE or re-INVITE requests to the Server.
Session Refresher: Selects which user agent is the session refresher. UAS (User Agent Server) is an
originator, and UAC (User Agent Client) is a replier.
SIP Message Timeout Adjustment
SIP Message Resend Timer Base: SIP packet will resend if response did not arrive in the base time
set in this column. It will send again at "base time" * 2, and send again at "base time" *2 *2. The
maximum resend time is four seconds. Resend will stop and restart when the total resend time has
reached 20 seconds.
Max. Response Time for Invite: If the destination does not reply in the set time, the call is failed.