ARS

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ARS

ARS (Alternate Route Selection) is used by IP Office 4.0+. It replaces LCR (Least Cost Routing) used by previous releases of IP Office. It also replaces the need to keep outgoing call routing short codes in the system short codes.

When a dialed number matches a short code that specifies that the number should be dialled, there are two methods by which the routing of the outgoing call can be controlled.

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Routing Calls Directly to a Line
Every line and channel belongs has an Outgoing Group ID setting. Several lines and channels can have belong to the same Outgoing Group ID. Within short codes that should be routed via a line within that group, the required Outgoing Group ID is specified in the short code's Line Group ID setting.

•	Routing Calls via ARS The short code for a number can specify an ARS form as the destination. The final routing of the call is then controlled by the setting available within that ARS form.

ARS Features

•	Secondary Dial Tone The first ARS form to which a call is routed can specify whether the caller should receive secondary dial tone.

•	Out of Service Routing ARS forms can be taken out of service, rerouting any calls to an alternate ARS form while out of service. This can be done through the configuration or using short codes.

•	Out of Hours Routing ARS forms can reroute calls to an alternate ARS form outside the hours defined by an associated time profile.

•	Priority Routing Alternate routes can be made available to users with sufficient priority if the initial routes specified in an ARS form are not available. For users with insufficient priority, a delay is applied before the alternate routes become available.

•	Line Types ARS can be used with all line types except Small Community Network (SCN) trunks.

•	For IP Office 4.2+, a SIP line is treated as busy and can follow alternate routes based on the SIP line setting Call Initiation Timeout. Previously a SIP line was only seen as busy if all the configured channels were in use.

•	IP lines use the NoUser Source Number setting H323SetupTimerNoLCR to determine how long to wait for successful connection before treating the line as busy and following ARS alternate routing. For IP Office 4.2+ this is now set through the IP line option Call Initiation Timeout.

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Small Community Network
Calls to SCN users are always routed using the appropriate SCN trunk. ARS can be configured for SCN numbers but will only be used if the SCN call fails due to congestion or network failure. However if the SCN becomes available before ARS finds an alternate route then SCN is used. This also applies to calls made across the SCN using the Break Out feature.

•	Main Route The ARS form 50, named "Main" cannot be deleted. For defaulted IP Office systems it is used as a default route for outgoing calls.

Routing Calls to ARS

1.	Create the ARS form.

2.	Create the required system, user or user rights short code to match the user dialing.

2.1.	In the Telephone Number field define the digits that will be used to match a short code in the ARS form.

2.2.	Use the Line Group ID field drop-down to select the ARS form required for routing the call.

Example ARS Operation

Default ARS
The simplest example for ARS operation are the settings applied to defaulted IP Office 4.0 systems. These vary between MU-Law systems and A-LAW systems.

A-Law IP Office Systems
This set of defaults is applied to A-Law systems, typically supplied to locales other than North America. The defaults allow any dialing that does not match an internal number to be routed off-switch as follows:

1.	System Short Code - ? / . / Dial / 50:Main The default system short code ? will match any dialing for which no other user, user rights or system short code match is found. This short code is set to route all the digits dialed to ARS form 50.

2.	ARS Form - 50:Main This form contains just a single short code.

�	? / . / Dial3K1 / 0 This short code matches any digits passed to the ARS form. It then dials the digits out on the first available line within line group 0 (the default outgoing line group for all lines).

MU-Law IP Office Systems
This set of defaults is applied to MU-Law systems, typically supplied to locales in North America. The defaults route any dialing prefixed with a 9 to the ARS and secondary dial tone.

1.	System Short Code - 9N / N / Dial / 50:Main The default system short code 9N is used to match any dialing that is prefixed with a 9. It passes any digits following the 9 to ARS form 50.

ARS Form - 50:Main
This form has secondary dial tone enabled. It contains a number of short codes which all pass any matching calls to the first available line within line group 0 (the default outgoing line group for all lines). Whilst all these short code route calls to the same destination, having them as separate items allows customization if required. The short codes are:

�	11 / 911 / Dial Emergency / 0 This short code matches an user dialing 911 for emergency services.

�	911 / 911 / Dial Emergency / 0 This short code matches an user dialing 9911 for emergency services.

�	0N; / 0N / Dial 3K1 / 0 This short code matches any international calls.

�	1N; / 1N / Dial 3K1 / 0 This short code matches any national calls.

�	XN; / N / Dial 3K1 / 0 This short code matches 7 digit local numbers.

�	XXXXXXXXXX / N / Dial 3K1 / 0 This short code matches 10 digit local numbers.

© 2009 AVAYA
15-601011 Issue 23.p.-
07:06, 30 October 2009
(html_ars_overview.htm)

Performance figures, data and operation quoted in this document are typical and must be specifically confirmed in writing by Avaya before they become applicable to any particular order or contract. The company reserves the right to make alterations or amendments at its own discretion. The publication of information in this document does not imply freedom from patent or any other protective rights of Avaya or others. All trademarks identified by (R) or TM are registered trademarks or trademarks respectively of Avaya Inc. All other trademarks are the property of their respective owners.

Last Modified: 24/06/2009