Reference:Configuration/BRI/Interop

Usually it should not be necessary to do any adjustments on this page. Nevertheless some ISDN implementation are not compatible to what we consider the standard.

Automatic Keypad	This options enables Automatic Keypad sending. This means that if the first dialed digit to be sent on this interface is either '*' or '#' the digits are not sent as called party number, but as Keypad information instead. This is used on some ISDN networks for non call related supplementary services (e.g. *21No# to set call forwarding).
Suppress Sending of HLC	The HLC (Higher Layer Compatibility) information element is used to provide end to end information about the application (e.g. Telephony) of the call. Very rarely ISDN implementations do no support it and thus reject calls. With this checkmark the sending of the HLC can be suppressed.
Suppress Sending of FTY	The FTY (Facility) information element is used for supplementary services. This option supresses the sending of FTY to avoid problems with incompatibilites of the facilities. No Supplementary Services are possible in this case.
Suppress Subaddress	No subaddress information elements are transmitted.
No Restart	The Restart procedure is used by the device after establishment of the link layer to make shure no call exists on any channel. This is useful because some PBXs do no clear all calls if the link layer is disconnected. With this option this restart procedure is disabled.
Passive Layer2	Normally the device tries to establish the link layer on point to point interfaces as soon as the physical layer is established. This behaviour is esspecially incompatible to some ISDN conformance test equipment even if it conforms to standard. This option turns this off.
No Overlap Receive	Normally, single digit dialling (overlapped sending) is not used to call terminals (that is, devices in TE mode) on point-to-multipoint connections. Under certain circumstances however, it is possible for gateways to be connected to a PABX system in precisely this mode and then also support incoming single digit dialling (overlapped receive). In this case, an incoming SETUP message is answered, as required in the standard, with a SETUP_ACK message. Some PABXs, however, do not expect this sort of message from terminal equipment and terminate the call at this point. In such a case, the No overlap receive setting prevents the gateway from answering the incoming SETUP message with a SETUP_ACK.
No Disc	No DISC information elements are transmitted. REL is transmitted instead.
Annex N	Allows the sending of inband information during an established call (only in TE mode).
Volume	Here, you can set a value in decibel (db) between -32db and +32db.
CR Length	Call reference value in bytes. Normally the length of the Call reference is defined by the standard. Esspecially in the QSIG environment deviations from the standard are found, so it can be adjusted manually.
CHI Type	Coding of the Channel Information Element is different for Basic Rate (BRI) and Primary rate (PRI) interfaces, but for QSIG the PRI coding is defined for BRI interfaces as well. Some QSIG implementation use BRI coding of the Channel Information Element on a BRI interface. With this option the coding can be adjusted manually.