10.16.3.1. Data editing for CorNet-NQ 
- The A station (checking party) first enters:
<Code CTLS>After this code is identified and the CTLS classmark was successfully checked, a digit counter is initialized. If the user has no authorization any further inputs are rejected ('NOT AUTHORIZED' and a corresponding tone).
- With proper authorization the user enters
#<PEN># or #<PEN>*A 'CTLS' flag, as well as a 'PEN' flag, are set and the digit counter is incremented depending on the length of the PEN. These values together with the entered PEN are stored in the CPB and transmitted to CorNet-NQ, depending on the interface to be defined.
- The successful seizure of the previously entered PEN initiates the following
procedure: The test is terminated, if another '#' is recognized
(not after an *, see below). If
<PEN># or # <PEN>*is entered again, the PEN is saved in the CPB and then transmitted to CorNet-NQ, together with the updated digit counter and the 'PEN' flag, depending on the interface to be defined.
- If the last character entered was a '*' then a station number
must now be entered:
<Station number>#This station number is saved in the CPB and then transmitted to Cornet-NQ, together with the updated digit counter and the 'Station number' flag, depending on the interface to be defined.The actual node checks for the following:
- If the DAR of this station number established in WABE leads to a trunk, then the trunk is only seized and the station number transmitted, if the parameter CTLS is set in COT for the corresponding trunk group.
- If the DAR established in WABE leads to a station ('STN'),
the following is checked:
- If the station number is a hunting group number, the number is not transmitted and the test is terminated.
- If the destination number is configured in the same PBX as the A station or if the destination switch was reached via CorNet-NQ, the destination is dialed as usual. Call forwarding, call forwardings on no answer, call pickup groups and intercepts, however, are disregarded.
- The 'Station number' flag is set. The station number is saved in the CPB, together with the updated digit counter and the flag. After the station number is transmitted, the test is terminated.
If the last entered character was a'#'then the procedure is continued as described under A), provided a PEN was specified.
Notes:
- General notes:
- If the end criterion '##' of the CTLS test is entered, all trunks concerned remain seized. The tone injected after the entry of the first '#' remains audible. A ringing status can change to call status and a call status reached before the input of the second '#' also remains established.
- If a station number is entered with a destination other than in the current PBX, then LCR is no longer avoided. Call charges are accrued, if this station number leads to a CO trunk!
- The terminals used for the CTLS test are protected agains camp-on for the test duration.Emergency override / disconnect during CTLS Test is possible
- Notes on terminal key behaviour
- CTLS is used for line testing. Therefore, only digit and repertory keys are supported. One station number or, alternatively, one PEN can be stored per repertory key. The use of other keys will be rejected, in particular an attempt to establish a 3-party connection.
- AC: If the AC is called during start-of-dialing for the CTLS test and the operator presses either the Personal key or the OPR key to accept this call, the CTLS test is terminated. If, however, the AC is called during a CTLS call, the call can be accepted by pressing the Personal or OPR key. The CTLS call remains in the background and can be resumed by pressing the DIAL key.
- During the CTLS test, the CLEAR key on the AC has the same effect as the RELEASE key, i.e. the CTLS test is terminated.
- With the exception of the repertory keys and the other keys mentioned above, all other AC keys are rejected.
- DIGITE: If the DIGITE is called during start-of-dialing for the CTLS test and the user presses the "Call waiting" key to accept this call the CTLS test is terminated. If, however, the DIGITE is called during a CTLS call, the waiting call can be accepted by pressing the "Call waiting" key. The CTLS call remains in the background and can be resumed by pressing the TOGGLE key. Conference and call transfer are not possible.
- With the exception of the repertory keys and the other keys mentioned above, all other DIGITE keys are rejected.
- With ANATE, the callback key for establishing a 3-party connection is rejected. All keys, with the exception of the digit keys, are not supported.
- Notes on networking:
- In a network, CTLS connections are signaled as such, if possible. If, e.g. the last entry for a CTLS test is a station number which leads to the digital network via a DAR and the trunks seized using LCR are "CTLS capable", then the CTLS test task is transmitted via these trunks. A log printout is generated in every transit node.
- If a breakout to an analog network is achieved by entering the PEN, the test is terminated. In this state, in the best case (i.e. the trunks could be seized by CP), the information signalled inband depends on the type of CO trunk. With signalling without dialing tone from CO (e.g. MFC-R2) there are no audible tones. In this case, dialing to CO should be allowed (COT CTLS set on the trunk), e.g. to reach a test tone transmitter. However, this should only be a temporary solution and not become the rule as this procedure allows abuse as call charges can no longer be assigned to the originating party. The charges can only be assigned at a later date by a comparison of the test log printouts.
- The test possibilities are also restricted for trunk circuits which need complex information from the LCR in order to be seized (e.g. CIS signalling with ANI). This information is normally not available for CTLS seizures.