10.16.3.2. Provision of path selection 
In the incoming seized PEN the digit counter is reset and the protocol
delivered by CorNet-NQ is evaluated by converting the digit string into
a PEN, if the 'PEN' flag is set.
The test is terminated in the following cases:
- if the end criterion '##' is recognized. There is no system reaction.
- after the station number entered under <Station number># is transmitted; the system reaction configured for end-of-dialing is carried out;
- if the entered station number is a hunting group number (will not be transmitted); the NU tone is injected;
- if the station number exceeds 22 digits; the configured system reaction is carried out;
- if the syntax of the entered PEN is incorrect; the NU tone is injected;
- for the defined error cases (PEN busy, not existent or invalid for CTLS, PEN is defective) the configured tones are injected (busy tone, NU tone, negative acknowledgement tone);
- if the outgoing seized trunk was an analog trunk, a CAS or a trunk circuit and further PENs were dialed; the NU tone is injected;
- if a station number which leads to a circuit is transmitted and the CTLS parameter is set in the COT for the outgoing trunk group; the system reaction configured for end-of-dialing is carried out;
- after the evaluation of the station number and before the circuit is seized, if the CTLS parameter is not set in the COT of the outgoing trunk group; the connection is backwards released to the originating node;
- if an SLMA terminal (exception:VMX) is administrated on a selected PEN. The corresponding tones are injected, depending on the station status.
IMPORTANT:
If analog, CAS or trunk circuits are seized without station number, the
reception of the dialing tone cannot be guaranteed, e.g. with MFC/R2 dialing or analog
tie
lines. These cases require specialist knowledge of the paths to be tested.