When routing new calls to a particular packet group, the 5ESS
®
switch will avoid selecting any SCTP associations that are not
functioning properly. This increases the reliability of the signaling
pertaining to a packet group.
User Datagram Protocol
(UDP)
SIP can use User Datagram Protocol (UDP) in place of SCTP to
provide the transport layer over an IP-based network, if adjacent
network elements support UDP, but not SCTP. The use of UDP
transport simplifies data provisioning, but lacks some of the benefits
offered by SCTP, most notably the multi-homing and multi-stream
capabilities.
Because UDP is a connectionless, stateless, unreliable protocol, the
SIP layer is enhanced to handle retransmission of SIP messages and to
react to “Destination Unreachable” indications from the IP network
when the transport layer is UDP.
Paths
The 5E-XC
™
supports provisioning of UDP paths to identify the
near-end processor group, IP address and UDP port number, and
far-end IP address, and UDP port number to be used by the transport
layer for sending and receiving SIP messages over UDP for a
particular packet group. These UDP paths, however, have no
independent status and cannot be separately maintained (i.e., cannot
be manually removed or restored).
Signaling View
Architecture
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
2-23
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