Nortel Networks 1000 Installation and configuration, Configurable RUDP Timeout and Retries Count

Features Page 97 of 910
IP Line Description, Installation and Maintenance
• Associated non-ACD telephone is an IP Phone.
— If a failure occurs when the IP Phone is active, the ACD IP Phone
behaves as any other IP Phone. If the active associated IP Phone
changes the call state during the failure period (for example, releases
the call), the status message is sent to the Symposium and CTI
applications as the idle telephone reregisters with the system.
MCS 5100
The SIP calls between the CS 1000 IP Phone and a SIP party on the
MCS 5100 side are considered to be IP Peer calls. Such calls survive any type
of failure except a Call Server cold start.
Installation and configuration
The AFC feature for IP Phones requires no installation. It is active by default
on any CS 1000 system running the CS 1000 Release 4.5 software.
On a system running CS 1000 Release 4.5 software, every node running the
CS 1000 Release 4.5 LTPS software has the ACF feature enabled for the IP
Phones that register to it.
Configurable RUDP Timeout and Retries Count
When a network failure occurs and the IP Phone's connection is lost, the
IP Phone does not instantly start the failover process. The IP Phone waits for
a length of time for a reply from the server (the length of time is the value of
“RUDP timeout” in msecs). If the IP Phone does not receive a reply from the
server in that length of time, the IP Phone retransmits the message. The IP
Phone retransmits the message for the number of times of the “Retries count”
value, and then starts the failover process: the IP Phone tries to reconnect to
S1, then to S2 and so on.
Previously, the “RUDP timeout” was hard-coded to 500 msec, which meant
that the IP Phone detected the connection failure after a 5-second delay, and
“Retries count” was hard-coded to 10 retries. During that time, the IP Phone
appeared frozen to the user.