# Editing a digital exchange connection

Lets you define and configure the selected digital exchange connection.

Table 1. Digital exchange connection
Parameter | Explanation
Exchange connection | Identification number of the exchange connection
Name | Number of the exchange connection
Exchange connection type | Type of exchange connection
Protocol | Indicates the network protocol used.
Maximum incoming calls / Maximum outgoing calls | No further incoming/outgoing calls are routed via this trunk group once the set limit is reached. This is signalled to the caller by means of the congestion tone. This allows you to ensure that lines remain free for outgoing/incoming calls.
Maximum simultaneous connections | Once the set limit is reached, no more connections are set up via this trunk group.
Total B channels | Shows the number of available B channels in the case of digital network interfaces.

## Digital network interfaces

A digital exchange connection has one or more network interfaces of the same type.

Table 2. Network interface
Parameter | Explanation
Interface type | Interface name
Outgoing barred | Outgoing calls cannot be made via these network interfaces (does not apply to PRI interfaces).
Change exchange connection allocation | Lets you remove the network interface from the current exchange connection and allocate it to another exchange connection. The text message behind the input field tells you whether the selected exchange connection is compatible with this network interface.

## Call routing

After a first start, calls via digital trunk groups and SIP trunk groups are routed via the default routing. To route these calls via DDI numbers, create the DDI numbers in the DDI plan column in the graphical overview and link them with the digital trunk groups and SIP trunk groups respectively.

They can define the internal destinations depending on the switch position of the main switch group (switch group 1). The switch group can be used, for example, for Day, Night and Weekend switchovers with the communication server's control input. It can also be controlled with time functions, or operated manually with a phone.

Parent topic: Incoming call routing
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