# Editing the analogue network interface

The analogue network interfaces support DTMF and pulse dialling. Various parameters allow you to make country- and network provider-specific adjustments.

Table 1. Analogue network interface settings
Parameter | Explanation
Port | Port number of the network interface
Outgoing barred | This network interface is barred for outgoing calls.
Trunk groups | Trunk group allocation
Other settings:
Behind communication server | Activate this setting if this network interface is not directly connected with the exchange but down-circuit from a primary communication server. Digit barring is generally deactivated; the digit barring of the primary communication server has to be used. Incoming calls are forwarded transparently to the user.
Line attenuation | Short/Short D: For lines with a loop resistance below 280 Ohm. Long/Long D: For lines with a loop resistance above 280 Ohm. -D variants are used to increase the volume in an “analogue exchange - digital user” connection type by 3 dB in both directions as this type of connection is generally perceived as too quiet.
AC impedance | The impedance of the analogue exchange line is selected here. This setting varies from country to country and from one network provider to the next. The default settings differ depending on the country set.
Dialling mode | DTMF: Frequency dial PULSE: Pulse dialling Select DTMF if both types of dialling are supported on this exchange line circuit.
Ringing cycle(s) | If the amount of time between rings on the exchange line with incoming calls is longer than the value set here, the internal ring setting is interrupted. This is the case for example when the external caller hangs up.
Dialling-tone detection | The communication server waits for the dialling tone from the exchange before dialling begins.
Dialling tone time (s) | Waiting time for the exchange dial tone: If dialling tone detection is activated, the PBX switches over to the next free exchange line once the waiting time has elapsed. If dialling tone detection is deactivated, the dialling begins at the latest once the waiting time has elapsed.
International dialling tone | If an international dialling tone is selected, the dialling process is interrupted after one of 10 predefined digit sequences to wait for the international dialling tone. The sequences can be defined in the International dialling tone view.
Exchange digit barring | Select the exchange digit barring for this network interface here. If this network interface is not directly connected to the exchange, but is rather connected down-circuit to a primary communication server (setting Behind communication server), you must select an exchange digit barring in which the communication server's exchange access prefix is entered. Configure exchange digit barring under Call routing / Exchange / Exchange digit barring . --> at the moment (R3.2) still missing. is it intentional???
Release signal:
Release signal | If a connection is terminated only unilaterally by the external call party, the connection is maintained until the exchange sends a release signal. If a connection is terminated only unilaterally by the external call party, the connection is maintained. High call charges may be incurred. Note: Not all network providers send a release signal.
Release signal type | The type of release signal depends on the network provider. The Busy tone and congestion tone: The frequency and time sequence of the busy tone vary from country to country. Detection is automatically adapted to the set country.
Busy/Congestion tone level | The level of the busy tone and congestion tone is not necessarily the same on all exchange lines. Lets you adapt the detection to the existing level.
CLIP detection:
CLIP detection | The network provider supports CLIP on this exchange access and the communication server should take it and re-use it. The network provider does not support CLIP on this exchange access.
Alerting signal type | Lets you select the way in which the network provider transmits the CLIP data. No alerting signal: Data transmission takes place between the first and second ring signal. The first ring signal is used as an alerting signal. Ring pulse: Data transmission takes place before the first ring signal. A ring pulse is used as an alerting signal. Dual Tone: Data transmission takes place before the first ring signal. Two successive tones (Dual Tone) are used as the alerting signal. Line Reversal & Dual Tone: Data transmission takes place before the first ring signal. A line polarity reversal is used as the alerting signal, followed by two successive tones (Dual Tone). Not defined: No data is detected.
CLIP detection mode | This is a country-specific setting. FSK: The clip data is transmitted as FSK signal (Frequency Shift Keying). This default setting applies for most countries. DTMF: CLIP data is transmitted with the help of DTMF signals (applies, for instance, to Saudi Arabia).

Parent topic: Incoming call routing
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