AudioControl VERSION 6.2 manual SIP-Dialog Rate Control

SIP Release Notes 1. What's New in Release 6.2

8.Classifying IP Call to Proxy Set based on IP Address, Port, and Transport Type:

	Product
MP-11x		MP-124
Mediant 600		Mediant 1000
Mediant 800 MSBG		Mediant 1000 MSBG
Mediant 2000
Mediant 3000/TP-6310		Mediant 3000 HA/TP-6310
Mediant 3000/TP-8410		Mediant 3000 HA/TP-8410
	Management Protocol

Web

INI

SNMP

EMS

CLI

This feature provides the ability to classify an IP call to a Proxy Set based on either its IP address, or its IP address, port, and transport type (e.g., UDP). As a Proxy Set can be defined with up to five Proxy IP addresses with or without associated ports and/or transport type, this provides greater flexibility in classifying a call with a Proxy Set. This feature is configured using the new parameter, ClassificationInput in the existing Proxy Set table (ProxySet parameter).

9.SIP-Dialog Rate Control:

	Product
Mediant 800 MSBG		Mediant 1000 MSBG
Mediant 3000/TP-6310		Mediant 3000 HA/TP-6310
Mediant 3000/TP-8410		Mediant 3000 HA/TP-8410
	Management Protocol

Web

INI

SNMP

EMS

CLI

This feature provides support for SIP-dialog rate control, using the “token bucket” mechanism. The token bucket is a control mechanism that dictates the rate of SIP- dialog setups based on the presence of tokens in the bucket – a logical container that holds aggregate SIP dialogs to be accepted or transmitted. Tokens in the bucket are removed ("cashed in") for the ability to setup a dialog. Therefore, a flow can setup dialogs up to its peak burst rate if there are adequate tokens in the bucket and if the burst threshold is configured appropriately:

•Every SIP dialog setup request must attempt to take a token from the bucket.

•If there are no tokens, the request is dropped.

•New tokens are added to the bucket at a user-defined rate (token rate).

•If the bucket contains the maximum number of tokens, tokens to be added at that moment are dropped.

A token bucket is configured in the SBC Admission Control table

(SBCAdmissionControl parameter), using the following new parameters:

•Rate = Rate at which tokens are added to the bucket (i.e., token rate). One token is added to the bucket every 1000/Rate milliseconds. The rate of dialog setups per second, or unlimited if set to 0 (default).

•Max Burst = Maximum tokens that can fill the bucket. At any given time, the bucket cannot contain more than this amount of tokens. The maximum burst size for the dialog setup rate, unlimited if set to 0 (default).

Dropped requests are replied with the 486 “Busy Here” SIP response. Dropped requests are not counted in the bucket.

Version 6.2 57 December 2010