Administering trunk-group parameters

Last Updated : Jul 20, 2020 |

Procedure

  1. Enter trunk-group <tgnum> <group-type>, where tgnum is any number from 1 to 2000 and <group-type> can be one of the following:

    • loop-start (analog)

    • did (analog)

    • ground-start (analog)

    • bri (ISDN basic rate)

    • t1-isdn (ISDN primary rate on 1.544 Mbps facility)

    • e1-isdn (ISDN primary rate on 2.048 Mbps facility)

    • t1-inband (non-ISDN rate on 1.544 Mbps facility)

    • e1-inband (non-ISDN rate on 2.048 Mbps facility)

    The command line prompt changes to super-sls/trunk-group-<tgnum>. If you want to remove the trunk group from the SLS administration, enter exit to leave the second-level trunk-group context and return to the (super-sls)# context, and then enter clear trunk-group <tgnum>.

  2. Enter set dial <dial-type>, where <dial-type> is either rotary or dtmf.

    For example, set dial dtmf establishes that the trunk group uses DTMF signaling.

  3. Enter set tac <tac>, where <tac> is a 1 to 4 digit numeric value (plus initial # and * on all but rotary dial phones) for this trunk’s access code (TAC).

    The TAC value must be unique among all trunk groups, extension numbers, and ARS Feature Access Code (FAC) strings.

    For example, set tac 88 establishes access to this trunk group by dialing 88.

  4. Enter add port <module> <port> <sig-group> to specify the port that is compatible with the device and/or media module.

    The <sig-group> argument is necessary for a digital ISDN-PRI trunk. It is an integer number from 1 to 650 that specifies the signaling group associated with the management of this trunk member.

    Note:

    Administer the signaling group and DS1 information before you add any ports to the trunk group.

    Example 1

    If an MM711 is inserted into slot V3 and an analog loop-start trunk is to be administered for port 4, then add port V304 administers an analog loop-start trunk through port V304.

    Example 2

    If an MM722 is inserted into slot V2 and an ISDN BRI trunk is to be administered for port 1, then add port v201 adds a BRI trunk for the first physical port of the Branch Gateway media module to a trunk group using one B-channel of the BRI link.

    Note:

    You cannot mix BRI and PRI trunks within the same trunk group. If you attempt to assign more than the maximum number of trunks to a trunk group, an error message instructs you to delete a trunk member before adding a new trunk. A physical trunk can be a member of only one trunk group.

  5. For an analog DID trunk group, enter set supervision <sup-type> to set the incoming signaling supervision mode.

    <sup-type> can be either immediate or wink.

    For example, set supervision wink assigns wink-start incoming signaling supervision to a DID trunk group.

  6. For a non-ISDN digital trunk (t1-inband or e1-inband), enter set supervision <sup-type> to set the incoming signaling supervision mode, where <sup-type>can be one of the following:

    • loop-start

    • ground-start

    • wink-wink

    • wink-immediate

    • wink-auto

    • immediate-immediate

    • auto-auto

    • auto-wink

  7. For an analog DID trunk group or DS1 non-ISDN tie trunk group, enter set digit-treatment <digit-treat>, where <digit-treat> can be one of the following values:

    • blank (use this value to prevent any absorb or insert digit treatment from being applied)

    • absorb1

    • absorb2

    • absorb3

    • absorb4

    • absorb5

    • insert1

    • insert2

    • insert3

    • insert4

      Examples

    For example:

    • set digit-treatment absorb1 removes the first digit from the incoming DID trunk

    • set digit-treatment blank removes any digit treatment from the trunk group

  8. For analog DID trunk groups or DS1 tie trunk groups, enter set digits <digits> to define the inserted digit string, where digits is the number of digits.
    Note:

    The number of digits must comply with the digit-treat parameter in the set digit-treatment command. If the digit-treat parameter is insert3, then the digits parameter for this command must be three digits in length.

  9. Enter set name <name> to identify the user name for the trunk group.

    Use the 1 to 27 character name as specified on CM (add trunk-group n). Type the name string inside double quotes.

  10. For ISDN trunks, enter set codeset-display <codeset> to identify which Q.931 codesets are allowed to send display information to the user phone: codeset0, codeset6, or codeset7.
  11. For ISDN trunks, enter set codeset-national <codeset> to identify which Q.931 codesets are allowed to send National Information Elements (IEs, or display information) to the user phone: codeset6 or codeset7.
  12. For ISDN trunks, enter set channel-preference <type> to define how the Channel Identification IE field is encoded, where <type> can be one of the following:

    • exclusive. The central office must have the ability to grant a call on this channel or reject the call attempt

    • preferred. The central office might offer the call request on another available channel

  13. For ISDN trunks, enter set digit-handling method to define the order of reception/transmission to be considered with the flow of inbound/outbound:

    • enbloc-enbloc

    • enbloc-overlap

    • overlap-enbloc

    • overlap-overlap

    Enbloc requires sending the entire collected digit string in one block. Overlap sends the digits one at a time as they are collected.

  14. For ISDN trunks, enter set japan-disconnect <yes | no> to specify whether to perform a disconnect sequence (CONNECT message followed by a DISCONNECT message).
  15. For ISDN trunks, enter set send-name <method> to define whether or not the calling, connected, called, or busy party’s administered name is sent to the network on outgoing or incoming calls.

    <method> can be one of the following:

    • no. The name is not sent to the network for incoming or outgoing calls

    • yes. The name is sent to the network for incoming or outgoing calls

    • restricted. The name is sent to the network as Presentation restricted

    Note:

    For this release, specify <method> as no, since sending a Calling Party Name is a future feature.

  16. For ISDN trunks, enter set send-number <method> to define whether or not the calling, connected, called, or busy party’s administered number is sent to the network on outgoing or incoming calls.

    <method> can be one of the following:

    • no. The number is not sent to the network for incoming or outgoing calls

    • yes. The number is sent to the network for incoming or outgoing calls

    • restricted. The number is sent to the network as Presentation restricted

    Note:

    For this release, specify <method> as no, since sending a Calling Party Number is a future feature.

  17. For ISDN trunks, enter set numbering-format <type> to specify the numbering plan for this trunk in Standard Local Survivability (SLS).

    The numbering plan encodes the Numbering Plan Indicator and Type of Number fields in the Calling/Connected Party Number IE in the ISDN protocol.

    <type>can be one of the following:

    • unknown. Both the Numbering Plan Indicator and Type of Number are unknown

    • public. The Numbering Plan Indicator meets the E.164 standard and the Type of Number is national

    Note:

    The SLS application is intended to operate into PSTN trunk interfaces. For this reason, the only two choices for network numbering plans identification are public (E.464) and unknown (no particular plan). For this release, specify type as unknown since SLS does not currently support an administrative table to calculate the Calling Party Number that is consistent with the numbering plan of the PSTN service provider.

  18. For non-ISDN digital trunks, analog loop-start and analog ground-start trunks, enter set incoming-destination extension to identify an extension to directly receive an incoming trunk call, for example, an attendant or a voice response/recording system.
  19. For non-ISDN digital trunks, enter set incoming-dialtone <yes | no> to specify whether to provide a dial tone in response to far-end trunk group seizures.
  20. For a DS1 circuit, enter set trunk-hunt <type> to specify the trunk-hunting search within a facility in an ISDN trunk group or through a non-ISDN digital trunk group, where <type> is one of the following:

    • ascend. A linear search from the lowest to the highest numbered available channels

    • circular. A circular search beginning with the point at which the search previously ended. When the search has reached the top of the channel list, it resumes at the bottom of the list in wrap-around fashion

    • descend. A linear search from the highest to the lowest numbered available channels

  21. Enter show to check the trunk-group administration.

    The following example shows all four trunk members assigned to one trunk-group:

    Group Type       Dial   Tac  Supervision         Treat   Insert
----- ---------- ------ ---- ------------------- ------- ------
    1        bri      -  *99                   -       -      -
    Name = Willow Street 2
Ports = v201,v202,v217,v218
Codeset  Codeset  Channel    Digit           Japan  Send Send   Number Trunk
Display  National Preference Handling        Discon Name Number Format Hunt
----- ---------- ---------- ----------- -------- ------- ------ ------ ------
codeset6 codeset6 exclusive  enbloc-enbloc   no     yes  yes    public ascend

    The following example shows twelve port members assigned as t1-inband signaling:

    Group Type       Dial   Tac  Supervision         Treat   Insert
----- ---------- ------ ---- ------------------- ------- ------
    1   t1inband   dtmf  *96      wink/immediate       -      -
    Name = Willow Street 2
Ports = v201,v202,v203,v204,v205,v206,v207,v208,v209,v210,v211,v212
Incoming-Dest Incoming-Dial Trunk-Hunt
------------- ------------- ----------
            -            no     ascend

    The report lists the trunk-group parameters.

  22. Enter exit to leave the trunk-group context in SLS.