Unistim Description - Nortel Meridian ITG Line 2.0 Description, Installation And Operation Manual

RUDP
Reliable User Datagram Protocol (RUDP) is used for E-LAN
communications between the Meridian 1 CPU and the ITG Line 2.0 cards,
and for T-LAN communications between the ITG Line 2.0 cards and the
i2004 Internet Telephones. RUDP is another layer on top of UDP. RUDP is
proprietary to Nortel Networks.
RUDP features:
• Reliable communication system over a network
• Packages are resent if an ACK is not received following a time-out
• Messages arrive in the correct sequence
• Duplicate messages are ignored
• Loss of contact detection
When a data sequence is packetized and sent from source A to receiver B, the
RUDP protocol adds a number to each packet header to indicate its order in
the sequence.
• If the packet is successfully transmitted to B, B sends back a ACK
(acknowledge) message to A, acknowledging that the packet has been
received.
• If A receives no message within a configured time, it retransmits the
packet.
• If B receives a packet without having first received its predecessor, it
discards the packet and all subsequent packets, and sends A a NAK (no
acknowledge) message which includes the number of the missed packet.
A retransmits the missed packet and continues from there.

UNIStim description

The Unified Network IP Stimulus Protocol (UNIStim) is the single point of
contact between the various server components and the i2004 Internet
Telephone.
UNIStim is the stimulus-based protocol used for communication between an
i2004 Internet Telephone and a Terminal Proxy Server on the ITG Line card.
ITG Line 2.0/i2004 Internet Telephone Description, Installation, and Operation
Description Page 27 of 302