CHAPTER28 Configuring Supplementary Services
Mediant 1000 Gateway & E-SBC | User's Manual
● From the 'Flash Keys Sequence Style' drop-down list (FlashKeysSequenceStyle), select
Sequence 1 or Sequence 2 to use the flash + 3 key-combination to create the three way
conference call.
8. Click Apply and then reset the device with a save-to-flash for your settings to take effect.
Emergency E911 Phone Number Services
This section describes the device's support for emergency phone number services.
The device supports the North American emergency telephone number system known as
Enhanced 911 (E911), according to the TR- TSY- 000350 and Bellcore's GR- 350- Jun2003
standards. The E911 emergency system automatically associates a physical address with the
calling party's telephone number, and routes the call to the most appropriate (closest) Public Safety
Answering Point (PSAP), allowing the PSAP to quickly dispatch emergency response (e.g., police)
to the caller's location.
Typically, the dialed emergency number is routed to the appropriate PSAP by the telephone
company's switch, known as a 911 Selective Router (or E911 tandem switch). If the PSAP
receives calls from the telephone company on old-style digital trunks, they are specially formatted
Multi-Frequency (MF) trunks that pass only the calling party's number (known as Automatic
Number Identification - ANI). Once the PSAP receives the call, it searches for the physical address
that is associated with the calling party's telephone number (in the Automatic Location
Identification database - ALI).
FXS Device Emulating PSAP using DID Loop-Start Lines
The device's FXS interface can be configured to emulate PSAP (using DID loop start lines),
according to the Telcordia GR-350-CORE specification.
The call flow of an E911 call to the PSAP is as follows:
1. The E911 tandem switch seizes the line.
2. The FXS device detects the line seize, and then generates a wink signal (nominal 250 msec).
The wink can be delayed by configuring the parameter DelayBeforeDIDWink to 200 (for 200
msec or a higher value).
3. The switch detects the wink and then sends the MF Spill digits with ANI and (optional) Pseudo-
ANI (P ANI).
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