ASAI and Call Control
Denial (NAK) Cause
The ECS issues the following reasons as the cause for denying the request and ending the association:
■Mandatory Information Element missing (CS0/96)
The char_seq is missing from the request. A denial may be sent if another parameter is missing as well.
■Invalid number/domain (CS0/28)
Party_id is out of range or is a party on whose behalf ASAI cannot send DTMF tones (that is, a party other than a station or a trunk). Or, call_id is out of range.
■Invalid association (CS0/81)
The request is supported only over call control and domain control associations. An attempt has been made to request this service over another type of association.
■Invalid Information Element contents (CS0/100)
A value of an IE is outside the range specified, or a character sequence with a length of 0 or invalid characters has been supplied.
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Service or Option Not Available (CS3/63)
The provided call ID does not exist.
Message Not Compatible with Call State (due to call state)(CS0/98) DTMF signals can be generated only for active calls on which no other signaling tones are present. Or, the ECS capacity for simultaneous sending of DTMF digits is full (on a simultaneous basis, the ECS can only send DTMF digits on a maximum of 16 calls for R6si and a maximum of 32 calls for R6r). Also, the call must not be in vector processing or in a
■Reorder/Denial (CS3/42)
A request to send DTMF on a conferenced call with more than five parties is denied.
■Incompatible Call Options (CS3/80)
The tone duration is present but the pause duration is not present, or the pause duration is present but the tone duration is not present.
Protocol Error (NAK) Cause
The ECS issues the following cause for generating a protocol processing error:
■Protocol error (CS0/111)
The Q.932 protocol has been violated or the capability invoked is not consistent with this association. For example, invoking the Third Party Make Call capability on a Domain Control association is inconsistent.
