Page 60 of 910 Description
553-3001-365 Standard 4.00 August 2005
Signaling and messaging
The IP Line 4.5 application sends Scan and Signaling Distribution (SSD)
messages to the Call Server through the system’s ELAN subnet. When tone
service is provided, the service is signaled to the LTPS using new SSD
messages sent through the ELAN subnet.
Signaling protocols
The signaling protocol between the IP Phone and the IP Telephony node is
the Unified Networks IP Stimulus Protocol (UNIStim). The Reliable User
Datagram Protocol (RUDP) is the transport protocol.
RUDP
RUDP is used for:
• signaling between the Call Server and the Voice Gateway Media Cards
• signaling between the IP Telephony node and the IP Phones
Description
Signaling messages between the Voice Gateway Media Card and IP Phones
use RUDP. Each RUDP connection is distinguished by its IP address and port
number. RUDP is another layer on top of UDP. RUDP is proprietary to
Nortel.
The features of RUDP are as follows:
• provides reliable communication system over a network
• packages are resent if an acknowledgement message (ACK) is not
received following a time-out
• messages arrive in the correct sequence
• duplicate messages are ignored
• loss of contact detection
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