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ISDN PRI

A local T-1 line with Primary rate interface (PRI) is a form of ISDN (Integrated service digital network) with 23 paths for voice, video and data (not Internet) and one channel for signals. Each of the 24 channels transmits at 64 kilobits per second. The most common benefit of a PRI is Caller ID, although it is possible to use caller ID with a Traditional T-1 it is very uncommon and the customer is limited to the information they receive.

Benefits

HIGH CAPACITY 

  • Support for enterprises with large telephony systems (can carry 23 calls on a single line)
  • Supports a large number of users who need to make or receive phone calls with a small amount of PRI line usage. 

DIRECT INWARD DIALING

  • For each PRI line, the carriers provide around 100-500 numbers used by outsiders to call extensions directly, instead of going through a PBX Auto-attendant.

CALL HUNTING

  • Calls land on any free channel instead of the called number specifically which is possible by default through a PRI connection
  • For analog trunks this facility needs to be extended by the service provider and enabled on the PBX, involving additional cost at times.

 

Features

Calling

CALLER ID

  • All the extensions have their own number that displays in the phones that they are calling to.
  • Some call center applications are based on unique caller ID numbers for differentiation of services. 

TIE TRUNKS

  • Create a “link” between two PRI’s that terminate within the same Allstream Central Office switch.
  • Allows 3 or 4 digit internal dialing and name and number transfers.

RLT

  • Release Link Linking enables PBX to release lines associated with a recently transferred call.
  • This frees 2B channels on the customers PBX by transferring the work of maintaining a connection to the Allstream switch.
  • The maximum simultaneous calls per PRI is 46.
  • Additional monthly charges apply.

TLR

  • Temporary Local Redirect that redirects incoming calls to alternate locations anywhere in an emergency situation.

VIRTUAL GROUP

  • A framework within which features such as call routing is applied

TRUNK GROUPS

  • B channels controlled by the same D channel

SID

  • Service Identifier is used to further identify a preferred route for a call

 

Backup 

  • BACKUP D CHANNEL is used to back up automatically should the origional D channel fail