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SIP (session initiation protocol) uses UDP and TCP as a transport protocol as well as SCTP, TLS. In the case of using UDP as a transport protocol, it is required to guarantee symmetric response routing for NAT or FW traversal. By the way, in the case of RFC3265-based presence services using SIP, there is some situation that requires symmetric dialog request/response routing for NAT. In this paper,...
It is important issue to support emergency service in VoIP, because many users want to use the emergency service like PSTN network. Emergency Service for VoIP is provided through PSTN network in Korea, only audio data can get to the emergency agent. VoIP terminals can create and send audio and video and image in the emergency call because of the VoIP terminal capabilities. Unfortunately the existing...
As e-mail services become generalized, spam mail is raging internationally. Especially the number of spam mails in Korea increases and the proportion of Korean spam mails to the international is not small. With large number of spam mails, the amount of damage such as processing time, filtering cost and unwholesome contents is increasing. To cut down the number of spam mail, 'opt out' and 'labeling'...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.