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Biamp Systems

Multiple call appearances in Tesira VoIP

Tesira VoIP interfaces can support two independent phone lines.  Each independent line can support up to 6 call appearances.  Each call appearance can be a call to a different far end.  However, there are limitations on how those call appearances can be used.

If there are no active call appearances, up to 6 call appearances can be on hold. With 1 active call appearance, up to 5 call appearances can be on hold. With 2 active call appearances, no other call appearances are allowed (no calls on hold allowed with 2 active appearances).

This article describes the limitations on active call appearances on a Tesira SVC-2 VoIP card or a TesiraFORTÉ VI. Each of these devices can support two VoIP lines, and the restrictions below apply independently to each line.

Two active call appearances

The maximum number of active call appearances (i.e. call appearances that are not on hold) per line is two.  When two call appearances are active, no other call appearances can be used for any purpose (an active call or a call on hold).

With 2 active call appearances, no other call appearances are allowed.

  • If you have 3 calls on hold you can choose any one of those to become an active call, but to conference in a second call appearance you need to disconnect the 3rd call before the conferencing can take place.
  • If 2 call appearances are in conference, any attempt to have a 3rd appearance dial in will result in a busy tone / redirect to voicemail / etc. since the system is already fully engaged.
  • If a user tries to initiate a 3rd call appearance from the Tesira VoIP they will get an audible error tone / warble indicating they cannot complete the action.

Less than two active call appearances

If there are no active call appearances, up to 6 call appearances can be on hold.

If there is only one active call appearance, then all of the remaining call appearances can have calls on hold. In this case, the VoIP interface will allow the active call appearance to be put on hold and a different call appearance made active.