1.15 Optional Device Features112 Feature GuideConditionsWARNINGThere is a risk that fraudulent telephone calls will be made using the Outside-to-Outside (CO-to-CO)Line Call feature of DISA.The cost of such calls will be billed to the owner/renter of the PBX.To protect the PBX from this kind of fraudulent use, we strongly recommend:a) Enabling DISA security (Trunk Security or All Security).b) Maintaining the secrecy of passwords.c) Selecting passwords that are complex and random, so that they cannot be easily guessed.d) Changing passwords regularly.• The maximum recording time of each message is 3 minutes.• The preinstalled DISA/UCD OGM card can play only one message at a time and the total recordingtime of the PBX for DISA/UCD OGMs is 3 minutes.• To use this feature, "DISA" must be selected as the distribution method for the desired outside (CO) lineport ( CO Line Mode—Day/Night/Lunch [414-416]).• DISA Delayed Answer TimeIt is possible to set the DISA Delayed Answer time ( DISA Delayed Answer Time [504]) so that thecaller will hear a ringback tone for a preprogrammed length of time before hearing a DISA OGM or ashort beep.• Call Forwarding (FWD) to Outside (CO) LineWhen a DISA call is forwarded to an outside party, the caller is not required to enter a DISA securitycode regardless of the security mode.• DISA OGM Mute TimeCertain DTMF signals, such as Caller ID information, may be sent from the telephone company whena call is first connected. Because these signals may interfere with DISA, the PBX can be programmedto ignore DTMF signals for a specified amount of time ( OGM Mute Time [519]) after a call isconnected. After the DISA OGM Mute Time passes, DTMF signals are recognised by the PBX and theDISA OGM begins playing or a short beep is sent.• SMDRThe following are logged by SMDR for DISA calls ( 1.20.1 Station Message Detail Recording(SMDR)):– The destination of the DISA call– DISA security code status• Call DenySystem programming determines which extensions can receive DISA calls ( DISA IncomingAssignment [516]). If a DISA call is received at an extension that has Call Deny set, the caller will heara reorder tone and the call will be disconnected automatically. If a DISA call is received by a DISA ringgroup, this programme does not function for extensions in that DISA ring group and these extensionswill still ring.• Cyclic Tone DetectionIt is possible to select the number of times a cyclic tone must be detected while the DISA OGM is sent( Cyclic Tone Detection [513]). Cyclic Tone Detection can be used to disconnect an outside-to-outside (CO-to-CO) line call via DISA.• Fax ConnectionSystem programming determines the extensions that are able to receive fax data when the PBXreceives a fax (CNG) tone via the DISA feature ( FAX Connection [503]). The preprogrammedextension will automatically have the Data Line Security feature set.• Fax Tone DetectionIt is possible to select the number of times the fax (CNG) tone must be detected while the DISA OGM
