By Yi Liang

Call Control is one of the most important parts in the control layer of the NGN.  Signaling is used in the network to set up calls between two end users and to pass information about the call state between the various call agents involved in handling the call.  IMS uses Session Initiation Protocol (SIP) to create a signaling network over the IP network.  The Real-time Protocol (RTP) is used for media transport

Research and development work in the following areas is very important.

• Protocol stack development and analysis
• System high availability
• System scalability
• Network security

The open source community is involved in some important areas. Particularly in integrated access devices and IP PBX software projects.  An example is the Freeswitch project.

This entry was posted on Tuesday, January 27th, 2009 at 7:27 pm and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.