the 5ESS
®
switch. Provisionable parameters control what signaling
information from 5ESS
®
switch call processing is (or is not) translated
into SIP headers; whether (or not) encapsulated ISUP is included in
SIP headers at the OPS; and what information from the SIP signaling
messages is (or is not) extracted from the SIP headers and/or
encapsulated ISUP to be delivered to call processing at the TPS. The
setting of these parameters for each packet group on the 5ESS
®
switch
is dependent on the SIP functionality supported by the switch at the
far end of the packet group.
Notes:
1. Refer to the Session Initiation Protocol (SIP) - Interface
Specification, 235-900-344, document for more detailed
information on SIP messages and interworking to and from TDM
messages.
2. Refer to System View in Chapter 2 of this document for more
information about the 5ESS
®
switch elements involved in the
intra-switch messaging between the SIP PH and the Call
Processing SM.
3. Refer to Chapter 5 of this document for details of provisioning
procedures for the Recent Change views that affect call flows,
particularly the provisioning of SIP Packet Groups (RC/V 5.71),
SIP Parameter Sets (RC/V 5.82), and mapping rules for
interworking between SIP and PSTN signaling (RC/V 5.83).
Elements
The initial application for SIP signaling is in tandem/toll offices.
Considering this, there are five key network elements that a call
traverses. They are:
• Originating Switch
• Originating Packet Switch (OPS)
• Routers
• Terminating Packet Switch (TPS)
• Terminating Switch
Network Architecture
Call Flow
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
3-5
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