Page 40 of 236 ITG Line 2.1 NTVQ55AA card553-3023-211 Standard 1.00 June 2001• Uses RTP/RTCP protocol to transport audio between the ITGL Gatewayand the i2000 series Internet Telephone• Encodes/Decodes audio from PCM to and from i2000 series InternetTelephone’s format• Provides echo cancellation for the speaker on the i2000 series InternetTelephoneVirtual TNsVirtual TNs (VTNs) allow service data, such as key layout and class ofservice, to be configured for a terminal, without requiring a physical terminalconnection.The concentration of i2000 series Internet Telephones is made possible bydynamically allocating a port (also referred to as a Physical TN) of the ITGcard for a TDM – i2000 series Internet Telephone call. All SuccessionCSE 1000 speech path management is done with Physical TNs instead ofVirtual TNs.The choice of the port is not restricted to the ITG where the TPS handling aparticular i2000 series Internet Telephone is running. The port can beallocated to any ITG card dedicated to i2000 series Internet Telephones. Thei2000 series Internet Telephones (Virtual TNs) are defined on Virtualsuperloops.A virtual superloop is a hybrid of real and phantom superloops. As withphantom superloops, hardware (for example, a line card) is not used to defineand enable units on a virtual superloop. As with real superloops, virtualsuperloops use the time slot map to handle i2000 series Internet Telephone(Virtual TNs) to i2000 series Internet Telephone calls.Terminal Proxy Server descriptionThe Terminal Proxy Server (TPS) maintains a count of the number of setsregistered to the card. Each node has one active master. The active masterbroadcasts to all ITG cards requesting a response if it has room for anotherset. The maximum number of sets per card is 96.Note: The Succession CSE 1000 supports 640 registered telephone setson each Call Server. More than one Call Server can exist on a network.
