View source for AudioCodes - More than 8 lines needed

{{AI}}
See article [[Expanding Outgoing Call Capacity by adding 2nd Gateway]] for more modern solution.

==Situation==
The AudioCodes MP118 has 8 FXO lines which can be accessed with a single directory number from the AlphaCom stations. Usually "0". If more lines are needed, one must connect another AudioCodes MP11x and add this to the AlphaCom as a SIP node. Normally this will be accessed with a different directory number. In some cases it can be desirable to only have 1 directory number. 

==Solution==
Since there are no feedback to the AlphaCom from the AudioCodes on how many lines that are in use, the AlphaCom must keep track on this itself. This is done by the macro %tin which reports on how many trunks are in use in the SIPd. This article describes how to enable the use of 16 FXO lines, using 2 AudioCodes MP118.

==Programming==

====Create the SIP Trunk Nodes====
From the AlphaPro main menu, use the ‘+’ button next to the ‘Select Exchange’ dropdown list to create a new exchange.
The exchange type must be set to ‘SIP Node’.

Set the parameters as follows:

[[image:SIPNODE1.PNG|SIP Node 101|thumb|left|500px]]
[[Image:SIPNODE2.PNG|SIP Node 102|thumb|left|500px]]
<br style="clear:both;" />

The SIP Trunk IP address must be identical to the IP address of the SIP
Gateway.
Repeat this operation for the second SIP node.

====Define the AlphaCom / SIP routing====
In '''Exchange & System > Net Routing''' use the ''Insert'' button to create a route between the AlphaCom and the SIP Gateway. Set '''Preferred codec''' to ''G711u'' and '''RTP Packet Size''' to ''20 ms''.

[[image:SIPNODEROUTING1.PNG|AlphaNet Routing SIP Node 101|thumb|left|500px]]
[[Image:SIPNODEROUTING2.PNG|AlphaNet Routing SIP Node 102|thumb|left|500px]]
<br style="clear:both;" />

====Create Prefix number====
The directory number (prefix) used to access the telephone line must be programmed in the AlphaCom directory table with ''feature'' 83 and '''Node''' = SIP Trunk node number (101 and 102 in this example). Normally one will use directory number 0 to be used as prefix, but for the purpose of the wanted function we will use 9521 and 9522.

[[image:SIPNODEDIRNO1.PNG|SIP NODE 101 Directory Number|thumb|left|500px]]
[[Image:SIPNODEDIRNO2.PNG|SIP NODE 102 Directory Number|thumb|left|500px]]
<br style="clear:both;" />

===Create Event Trigger Number===
The number dialled by the user will actually be an Event Trigger. This must be added in the AlphaCom directory table as ''feature'' 52 and ''ID'' 0. The directory number is set to "0".

[[Image:SIPDIRNO0.PNG|Common Directory number: 0|thumb|left|500px]]
<br style="clear:both;" />

===Event Handler Programming===
One event is enough for this function. The event used is the event trigger, which is set off when the user dials "0". This event checks how many trunks that are in use in the first SIP Node. Based on the result it directs the call.

------------
{| 
|-
|width="100pt"|'''Event Owner''':
|width="400pt"|Stations w/ UDP Id: 8 (all stations)
|-
|'''Event type''': || [[Event Trigger (Event Type)|15 – Event Trigger Feature]]
|-
|'''Subevent''': || 0
|-
|'''When change to''': || ON
|-
|'''When related to''': || Directory Number: 0
|-
|'''Action''': || [[IF/ENDIF|IF]] [[%op]](%tin(101),=,8)
|-
| &nbsp; || [[CALL SETUP|$CALL]] L%1.dir L9522
|-
| &nbsp; || [[STOP]]
|-
| &nbsp; || [[IF/ENDIF|ENDIF]]
|-
| &nbsp; || [[CALL SETUP|$CALL]] L%1.dir L9521
|-
|}

==Explanation==
When a user dials "0", the event trigger will go on and check the number of trunks used in SIP node 101. If this value is 0-7 the user will be forced to call 9521. If 8 users are having an outgoing conversation with the first SIP Node (Node 101, dir no 9521) the event trigger will force the user to call 9522 instead.

==Expanding the System==
If more than 16 lines are needed, a third MP11x can easily be added. The following actions must be taken:
:- Add new SIP Trunk Node.
:- Add Routing.
:- Add Directory Number 9523.
:- Add ''IF'' statement to the Event Trigger Event which checks the trunks used in the second SIP Node.

Actions will be:

IF %op(%tin(101),=,8)

IF %op(%tin(102),=,8)

$CALL L%1.dir L9523

STOP

ENDIF

$CALL L%1.dir L9522 

STOP

ENDIF

$CALL L%1.dir L9521


[[Category: AlphaCom Applications]]
[[Category: AlphaCom - SIP Integration]]