Packet transfer device and communication system

Details Packet transfer device and communication system Packet transfer device and communication system

2011-05-03

2011-05-03

Sheikh, Ayaz R (Department: 2476)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

Reexamination Certificate

active

07936750

ABSTRACT:
In a network having an L2SW in which uplink VLAN is set, a transfer delay of a voice call packet is prevented. In a process of establishing a session between terminals (5), a packet transfer device (1) stores information capable of specifying a sending terminal (5-1) and a receiving terminal (5-2) and a correspondence relation (user connection information) to a connection port into a table. A SIP message of a session control packet communicated between the terminals (5) is snooped, and a destination IP address, a transmission source IP address, a destination port number, a transmission source port number, a connection port etc. are stored into the table. In a case where an RTP packet as voice data is received after the session is established, the packet transfer device (1) performs a loopback transfer or transfers it to an uplink port in accordance with the table.

REFERENCES:
patent: 6172991 (2001-01-01), Mori
patent: 6574240 (2003-06-01), Tzeng
patent: 7020707 (2006-03-01), Sternagle
patent: 7185094 (2007-02-01), Marquette et al.
patent: 7283519 (2007-10-01), Girard
patent: 2004/0125923 (2004-07-01), See et al.
patent: 2006/0036733 (2006-02-01), Fujimoto et al.
patent: 2006/0274768 (2006-12-01), Suzuki et al.
patent: 2006-109047 (2006-04-01), None
RFC 2327, W. Handley, et al., “SDP: Session Description Protocol” pp. 1-37, Apr. 1998.
RFC 1889, H. Schulzrinne, et al., “RTP: A Transport Protocol for Real-Time Applications” pp. 1-65, Jan. 1996.
RFC 3261, J. Rosenberg, et al., “SIP: Session Initiation Protocol”, pp. 1-232, Jun. 2002.

Affiliated with

Also associated with

Rating

Packet transfer device and communication system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Packet transfer device and communication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Packet transfer device and communication system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2627922