MLPP is supported on any type of telephone. Display telephones indicate information about each call at a precedence level above Routine. For details, see Precedence Display Indicators.
The default precedence level is Routine. You do not have to explicitly choose this level. You can dial an outgoing call at Routine precedence by dialing only the ARS leading digit (if required) and the telephone number. You don't have to dial the precedence selection code or the precedence digit. If desired, however, you can initiate a Routine call by dialing the MLPP access digit (range from 2 to 9) followed by the MLPP precedence digit 4.
You can make an outgoing call at a precedence level from Priority to Flash Override by dialing the MLPP access digit (range from 2 to 9) followed by the appropriate MLPP precedence digit (range from 0 to 3). If the MLPP precedence value assigned to your extension allows the precedence that you selected, you can complete your call by dialing the ARS leading digit, (if required) and then the number. You can complete your call by dialing the ARS leading digit (if required) and then the number.
Notes:
If the MLPP precedence value assigned to your extension does not allow the precedence selection, your call is given MLPP Unauthorized Precedence intercept treatment (error tone or announcement).
If the number you dial is not pre-emptable (Pre-emptable Subscriber set to "No" on the MLPP form), your call is given MLPP Cannot Preempt intercept treatment (error tone or announcement).
If you have a Maximum Precedence Level greater than Routine (from Priority to Flash Override) assigned to your extension and you select a precedence level when you dial a call, your call can preempt (warn and drop) other calls of lower precedence levels.
Both of the parties on the lower precedence level call hear the Preemption tone, but you do not hear it. You hear the Precedence Ringback tone only when the preempted party hangs up.
When you are on a call which is going to be preempted, you will receive the Preemption tone. Your call is then dropped. You should hang up immediately since the new call cannot ring at your extension until you hang up.
Note: A call at a precedence level above Routine may take slightly longer to set up than a standard call.
Both incoming calls and incoming MLPP calls can ring at the same extension. You can tell incoming calls that are at a precedence level above Routine from other calls by their different ringing pattern, as detailed in the following table.
|
Precedence Ring Cadences |
|
|
Type of Call |
Ringing Pattern |
|
Standard call/Routine calls. |
Long ring, long pause, long ring (repeated). This is called standard ringing. |
|
Calls above Routine precedence level, from all call sources (internal lines and MLPP-capable trunks). |
Short ring, very short pause, short ring, long pause (repeated). This is called MLPP precedence ringing. |
|
|
Display telephones indicate the precedence level of an incoming call at a precedence level above Routine when while it is connected to an MLPP circuit during incoming or outgoing calls, as detailed in the following table.
|
MLPP Precedence |
Telephone Display Indicator |
|
Flash Override |
FLASH OV |
|
Flash |
FLASH |
|
Immediate |
IMMEDIATE |
|
Priority |
PRIORITY |
|
Routine |
ROUTINE |
When a call is preempted, the called party hears a dual-frequency warning tone (440 Hz and 620 Hz) until the telephone is hung up. The other party of the preempted call hears 3 seconds of warning tone and is then released by the system.
