Lucent Technologies 5ESS User Manual

• GQPHs, and
• SCTP associations and association sets.
Note: The GQPHs are only on the non-DRM/VCDX.
Packet Switch Unit Model 2 (PSU2)
The PSU2 is the signaling message distribution point for SIP
messages between the near 5ESS
®
switch and the far 5ESS
®
switch.
To support the SIP feature the PSU2 is equipped with SIP PHs and
GQPHs.Note: The GQPHs are only on the non-DRM/VCDX.
Session Initiation Protocol Protocol Handler (SIP PH)
The SIP PH is a logical protocol handler that uses the PHE2
hardware. The SIP PH performs the message parser, message
reformer, and transaction manager functions for SIP messages.
For outgoing messages, the SIP signaling terminal process in a SMP
sends SIP related call information to the SIP PH and the SIP PH
constructs a:
1. SIP header message with call routing information, and a
2. SIP message body with application data.
For incoming messages, the SIP PH:
1. validates and translates SIP messages, and
2. delivers the data to the SIP signaling terminal process for
processing by the call processing programs.
The SIP PH converts message data between SIP messages and an
internal protocol used by the SMP. The internal messages are
transported between the SIP PH and the SMP by the GQPH.
The SIP PHs are configured as processor groups each having one or
two PHs. When redundancy is desired and processor groups are
provisioned in pairs, one SIP PH will dynamically be assigned the
“serving” role and the other as the “non-serving” role. During normal
operations, the serving SIP PH provides the non-serving SIP PH with
stable call data. Should the serving SIP PH fail, stable calls will be
preserved. Refer to “Serving/Non-Serving” (2-30) for more details.
A 100BaseT Ethernet interface is used to pass SIP messages between
the serving SIP PH and the IP network.
System View
Architecture
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235-200-118
Issue 3.02B, March 2007
Lucent Technologies
2-13

Lucent Technologies 5ESS Specifications

General

Brand	Lucent Technologies
Model	5ESS
Category	Switch
Language	English