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Avaya IP Office

The Avaya IP Office platform is the ultimate in converged voice and data technology. IP Office brings a combination of voice and data applications formerly reserved for only the largest corporations. Cutting edge customer service with easy to use tools is now available to the smallest of businesses.

Avaya IP Office Technical Tips
 
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EMEA IP Office Technical Tip
045: Analogue Trunk Disconnect Clear Operation
*Release Date: 19 July 2004


The IP Office uses two methods to disconnect Analogue calls :-

1) Line Break Disconnect (also known as Reliable Disconnect)
Detection of a Line Break condition (defined as < 5mA loop current in the line) for a period greater than that set by the Disconnect Clear Timer.

or

2) Tone Disconnect
Detection of a continuous Busy, or NU Tone, for 6 seconds.


Currently the Line Break Disconnect is only available for USA, Canada and UK, all other countries use Tone Disconnect.

When the Analogue Trunk -> Disconnect Clear checkbox is Selected the IP Office will disconnect a call whenever it detects a Line Break condition on the Trunk for a time greater than that set in the Analogue Trunk -> Disconnect Clear Timer box ( + 120mS) -
i.e. the IP Office expects a Line Break Disconnect event on this Trunk and NOT a NU/Busy Tone Disconnect.

When the Analogue Trunk -> Disconnect Clear checkbox is Not Selected the IP Office will only disconnect a call on that Analogue Trunk when it detects a 6 second continuous NU/Busy Tone - i.e. it never tries to detect a Line Break Disconnect event.

For those countries that use Tone Disconnect to clear a call (i.e. all countries except USA, Canada and the UK) the IP Office sends special information on initial call setup/connect when an incoming call from an Analogue Trunk is routed to the Voicemail
Server/Auto Attendant. If this call results in any form of Voicemail Recording/Message the Voicemail Server/Auto Attendant uses the special call setup/connect information to delete the last six seconds of any Recording/Message that is left (otherwise the
Recording/Message would contain the 6 seconds of Busy/NU Tone that is required to detect the Disconnection).

When the Analogue Trunk -> Disconnect Clear checkbox is Selected on a Trunk that does NOT provide a Line Break Disconnect event the IP Office will still disconnect a call when it detects a 6 second continuous NU/Busy Tone - i.e. the IP Office will disconnect this Trunk whenever a Line Break Disconnect OR a NU/Busy Tone Disconnect event is detected.

Note :-
The Analogue Trunk -> Disconnect Clear option is Selected by the Manager Application by default.

The Analogue Trunk -> Disconnect Clear option is Not Selected by the Configuration Wizard by default (i.e. Reliable Disconnect is Not Selected).

 

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