Small Business Phone System

T1 Line Overview

Each physical trunk port supports up to 24 channels in T1 mode, 23 channels in PRI and QSIG modes.

• Dialing Complete
  The majority of North-American telephony services use en-bloc dialing. Therefore the use of a ; is recommended at the end of all dialing short codes that use an N. This is also recommended for all dialing where secondary dial tone short codes are being used.   

Line | Line (T1)

Settings

• Line Number:
  Allocated by the system.

• Line Sub Type: Default = T1
  Set to T1 for a T1 line. For PRI see Line Form (US PRI). If set to ETSI, QSIG A or QSIG B see Line (E1).

• Channel Allocation: Default = 24 -> 1
  The order, 24 to 1 or 1 to 24, in which channels are used.

• Prefix: Default = Blank
  Enter the number to prefix to all incoming numbers for callback. This is useful if all users must dial a prefix to access an outside line. The prefix is automatically placed in front of all incoming numbers so that users can dial the number back.  

• Framing: Default = ESF
  Selects the type of signal framing used (ESF or D4).

• Zero Suppression: Default = B8ZS
  Selects the method of zero suppression used (B8ZS or AMI ZCS).

• Clock Quality: Default = Network
  Sets whether the IP Office takes it clock source for call synchronization and signalling from this line. One line connected to the IP Office should be set to Network. and wherever possible this should be a line connected to the central office exchange. Another line can be set to Fallback but all other lines should be set to Unsuitable.  

• Haul Length: Default = 0-115 feet
  Sets the line length to a specific distance.

• Channel Unit: Default = Foreign Exchange
  This field should be set to match the channel signaling equipment provided by the Central Office. The options are Foreign Exchange, Special Access or Normal.

• CRC Checking: Default = On
  Turns CRC on or off.

• Line Signaling: Default = CPE
  This field affects T1 channels set to Loop-Start or Ground-Start. The field can be set to either CPE (Customer Premises Equipment) or CO (Central Office). This field should normally be left at its default of CPE. The setting CO is normally only used in lab back-to-back testing.

• Incoming Routing Digits: Default=0 (present call immediately)
  Sets the number of routing digits expected on incoming calls. This allows the line to present the call to the system once the expected digits have been received rather than waiting for the digits timeout to expire. This field only affects T1 line channels set to E&M Tie, E&M DID, E&M Switched 56K andDirect Inward Dial.

• CSU Operation:
  Tick this field to enable the T1 line to respond to loop-back requests from the line.

• Enhanced Called Party Number: Default = Off
  This option is not supported for systems set to the United States locale. Normally the dialed number length is limited to 15 digits. Selecting this option increases the allowed dialed number length to 30 digits.

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