October 2023

This overview provides information about the features provided by estos ProCall Enterprise in operation at SIP terminals via estos uaCSTA Server and estos ECSTA for SIP Phones (TAPI) in operation of estos SIP Softphones via direct SIP communication with a virtual PBX (SIP).
ProCall Enterprise8.3
from V 7.1.5
Telephone system/Cloud PBXbis. cloud of bis. itk GmbH
with terminal/telephoneSnom 320


ProCall Enterprise
client for Windows

ProCall Mobile app






☑ ☑ 

Hang up

Answer/accept call

Hold call


Call back

Reject call

Forward call (without answering)

Set up a consultation call


Connect a consultation call

Initiate second call (e.g. from hold)

Accept second call

Reject second call

Forward second call (without answering)

Forward second call (after answering)

Second call on SIP line

Caller receives busy

Caller receives busy

Incoming call on SIP line while active mobile phone call:

  • Answer call

Mobile phone call is terminated

mobile phone call on hold **

  • Reject call (without answering)

Caller receives busy

Incoming mobile phone call while active SIP line call:

  • Answer call

SIP line call on hold

SIP line call on hold

  • Reject call (without answering)

Create a conference call (3 participants)

Add a further participant to a conference call

Remove a participant from a conference call

Pickup call
via UCServer (from 8.3)


  • TAPI – SIP (via speed dial code)

  • SIP – TAPI (via feature code)

  • SIP – SIP (via feature code)

Pickup call
via feature code


  • TAPI – SIP (via speed dial code)

  • SIP – TAPI (via feature code)

  • SIP – SIP (via feature code)



Dial ringing tone

Call forwarding

  • provided by PBX via TAPI

  • via feature code

  • provided by UCServer *2

Call protection/Do Not Disturb

  • via presence

  • via line


Function available
Availability or function planned/in realization
Not relevant
Not applicable due to technical limitations
Function not tested, full tests are pending
*1Presentation of hold state planned
*2Call forwarding by UCServer configurable for internal/external/all calls always or while busy
**Depending on the functions of the network provider
*** Supported functions for SIP lines in ProCall Mobile apps for connection via estos UCConnect

Further information

PBX-specific configuration: Setting up softphone functions (SIP) for bis. cloud PBX – connection instructions

Version note

Since estos has no influence on the further development of the supported telephone systems by the manufacturer, we cannot guarantee that the instructions described above will also be fully valid for future releases and e.g. other end devices.