Route Lists - Cisco ASR 5000 series Product Overview

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▀ How the SCM Works

Route Lists

Route lists are service level lists that assist in finding the next CSCF/UA hop. These are static routes and will override

any dynamic routes (based on DNS queries for FQDNs).

Signaling Compression

The Session Initiation Protocol (SIP) is a text-based protocol designed for higher bandwidth networks. As such, it is

inherently less suited for lower bandwidth environments such as wireless networks. If a wireless handset uses SIP to set

up a call, the setup time is significantly increased due to the high overhead of text-based signaling messages.

Signaling Compression (SigComp) is a solution for compressing/decompressing messages generated by application

protocols such as SIP. The P-CSCF component of the SCM uses SigComp to reduce call setup times on the access

network, typically between the P-CSCF and the UE. The following features are supported:

SigComp Detection - P-CSCF detects if the UE supports SigComp and compresses messages it sends to the UE.

The P-CSCF also detects if messages it receives are compressed and decompresses them.

SigComp Parameter Configuration - P-CSCF allows the configuration of Decompression Memory Size

(DMS), State Memory Size (SMS), and Cycles Per Bit (CPB).

Failure Acknowledgement - P-CSCF replies with NACK on decompression failure.

SIP/SDP Static Dictionaries - P-CSCF supports the Session Initiation Protocol/Session Description Protocol

Static Dictionary for Signaling Compression.

▄ Cisco ASR 5000 Series Product Overview

Session Control Manager Overview