Sip Routing Engine - Cisco ASR 5000 series Product Overview

Session Control Manager Overview
If a request is within 200 bytes of the path MTU, or if it is larger than 1300 bytes and the path MTU is unknown, the
request MUST be sent using TCP. This prevents fragmentation of messages over UDP and provides congestion control
for larger messages. P-CSCF/A-BG is also able to handle messages up to the maximum datagram packet size. For UDP,
this size is 65,535 bytes, including IP and UDP headers.
Large message support is needed for handling presence signaling traffic as the size of messages could be as large as
50K.

SIP Routing Engine

The SIP routing engine deploys SIP in a secure and controlled fashion.
Provides auto discovery of SIP elements, subscriber privacy, call fraud prevention, network security, and thwarting of
network overload conditions.
Shared Initial Filter Criteria (SiFC)
If both the HSS and the S-CSCF support this feature, subsets of iFC may be shared by several service profiles. The HSS
downloads the unique identifiers of the shared iFC sets to the S-CSCF. The S-CSCF uses a locally administered
database to map the downloaded identifiers onto the shared iFC sets.
If the S-CSCF does not support this feature, the HSS will not download identifiers of shared iFC sets.
Telephony Application Server (TAS) Basic Supported
The following describe the local basic call features implemented on the S-CSCF:
Abbreviated Dialing (AD)
Call Forward Busy Line (CFBL)
Call Forward No Answer (CFNA)
Call Forward Not Registered (CFNR)
Call Forward Unconditional (CFU)
Call Transfer
Call Waiting
Caller ID Display (CID)
Caller ID Display Blocked (CIDB)
Feature Code Activation/De-activation
Follow Me/Find Me
Locally Allowed Abbreviated Dialing
Outbound Call Restrictions/Dialing Permissions
OL-22938-02
Features and Functionality - Base Software ▀
Cisco ASR 5000 Series Product Overview ▄