Transfer — blind or consult

Last Updated : Oct 24, 2019 |
Prolog information
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  • CS 1000 endpoint user experience
    Call transfer is made using a transfer feature key (TRN) which is predefined for UNIStim and 39XX endpoints at a fixed position and digital 200X endpoints at an unfixed position. The Transfer key is available on the phone screen during an active call. The active call is put on hold, and the user receives a new dial tone when it is pressed. After the far-end is reached, the user can either complete the transfer (blind) or wait until the far-end answers the call (consultative) and then complete the transfer. The transfer completion is done by pressing the Transfer key again.
    The transfer call is made on behalf of an active DN key. For example: Phone A has a primary DN 2000 on key 0, DN 2001 on key 1. When there is an active call with key 1, the user initiates a transfer to another set B. Set B rings displaying DN 2001 as the caller number, not the primary DN of set A.
    Analog endpoint transfer operations
    To transfer an active call on an analog endpoint, the user would follow these steps:
    • Flash the switch-hook. The call is on hold.
    • Dial the number where you want to transfer the call.
    • Flash the switch-hook and then hang up, or simply hang-up (depending on specific optional Classes of Service) when you hear ringing or after your call is answered.
    When your call is answered, you may speak privately with the new party before completing the transfer.  
    Different Classes of Service will change the basic behavior into more specific behavior. For example:
    • The presence or absence of the Conference service can change the ability to transfer on ringing. When the endpoint has a “Conference Allowed” Class of Service, the switch-hook flash will create a conference. At that time, to complete the Conference the transferring party must hang up. Without the Conference Class of Service, the transferring party can hang up while on the consultation call.
    • “Three Party Service” allows the transferring party to use a control digit to toggle between the transferee and transfer target before completing the transfer or creating a conference. This also means the transferring party can drop either of the other two parties using a second control digit, when they are not the party on hold.  
      • To create a conference, press the “conference” control digit.  
      • To transfer the call, you must first create the conference and then release.
    Even with Classes of Service permitting transfer on ringing, you may not be allowed to transfer a ringing call involving certain types of trunks. For example, transfer on ringing to an unsupervised trunk is not allowed.
    To cancel an incomplete transfer, the typical procedure us to hang up and then lift the handset and flash the switch-hook to return to the call.
  • Device Adapter endpoint user experience
    • Digital and UNIStim stations
      The Transfer button is predefined for UNIStim and 39XX endpoints at a fixed position and digital 200X endpoints at an unfixed position. Communication Manager considers it as a restricted call appearance that cannot receive any incoming calls but can only be used for outgoing calls placed in the process of transferring a call. Device Adapter will treat this button as a CS 1000 Transfer key with existing localization.
      Both consultative and blind (transfer a ringing call) transfers are supported.
      The end user behavior is retained with following differences:
      • When a user presses the Transfer or Conference key during an active call, a simple dial tone is given as opposed to a special stuttered dial tone as in CS 1000.
      • A consultative call is made using the Transfer or Conference key which is a call appearance. That means the far end will always see the phone extension as CLID. This differs from the CS 1000 behavior where a consultative call is made on behalf of the DN key of original call. This should be taken into consideration when making an original call from a bridged appearance:
        1. Set A key 0 - brdg-app to Set B
        2. Set A calls Set C from key 0. Set C sees extension of Set B.
        3. Set A presses Transfer, and calls Set D. Set D sees extension of Set A, not Set B.
    • Analog stations
      The analog stations also support call transfer on the Device Adapter but with fewer options. CS 1000 permitted a user with an analog station that has transfer capability to:
      • Do a transfer or create a three-party conference.
      • Do a transfer or create a conference of up to six parties.
      When the transfer/conference capability is enabled, Device Adapter always allows six-party conferences in a station that is migrated from the CS 1000. The transfer is always available if conference is allowed.
      To do a transfer, the analog station user must be on an active call.
      • The user does a switch hook flash and receives a dial tone.
      • The user dials the number of the transfer target.
      • If the user hangs up while the transfer target is ringing, Device Adapter does a blind transfer.
      • If the user hangs up after the call to the transfer target is answered, the transfer is completed as a consultative transfer.
      • If the user does a switch hook flash while ringing, the transfer attempt is cancelled.
        This approximates the CS 1000 analog station user experience for transfer.
For more information, see Transfer — blind or consultative in Appendix H: Call processing features and services.