AudioCodes - More than 8 lines needed
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Contents
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:
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.
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.
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".
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.
| Event Owner: | Stations w/ UDP Id: 8 (all stations) |
| Event type: | 15 – Event Trigger Feature |
| Subevent: | 0 |
| When change to: | ON |
| When related to: | Directory Number: 0 |
| Action: | IF %op(%tin(101),=,8) |
| $CALL L%1.dir L9522 | |
| STOP | |
| ENDIF | |
| $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.