SIP Provider VoiceWorks (NL) (kb4431)

The information in this article applies to:

  • SwyxWare 2015
  • SwyxWare 2013
  • SwyxWare 2011 R2

[ Summary | Information | Links ]


Information und configuration hints for SIP provider VoiceWorks (Netherlands).


General information

VoiceWorks is offering a SIP trunk with user authentication. You have received information about UserID, UserName and UserPassword, whereas the naming may differ, or you might have only received UserName and -password. In this case, UserID and UserName are identical.


In case that the SwyxWare server is running with a private IP address and the static, public IP address is provided by NAT gateway, it is necessary to configure a STUN server in the properties of the SIP trunk group, under the tab 'SIP'. A list of public STUN servers can e.g. be found at

On outgoing calls VoiceWorks changes some characteristica of the RTP stream call setup and call answering. On a SwyxWare2011R2 or earlier versions, this may lead to a oneway voicechannel if internal encryption is active. Therefore on a SwyxWare2011R2 or earlier versions, in the tab "Encryption" of the SwyxServer properties, internal encryption must be deactivated

Voiceworks is offering the possibility to configure the SIP Trunk on the provider side via a web interface. Please be aware that changes in the settings must be reflected by the SwyxWare setting and adopted accordingly.

For FAX transmission via T38, VoiceWorks is offering separate SIP trunk. If this is required, a separate SIP trunk group must be created and a corresponding SIP trunk. For the trunk group, the routing record must have a higher priority than the one f the other trunk group. Additionally, the FAX User must be configured as exclusive user for that trunk group.


In order to assign incoming calls to the correct trunk, it is necessary to configure a SIP URI for the trunk. The assigned number block and the numberformat must be considered.
Numberblock: +31 36 1234560 ... +31 36 1234569
In this case, the SIP URI must be entered in the format 036123456*@*.

For your convenience the generated CustomProviderProfiles.config is available for download at the end of this article. Extended information about how to use this file can be found at Configuration and Adaptation of SIP Providers via Provider Profiles (kb3436).
Important: From SwyxWare2013 R4 on, the provider profile for VoiceWorks is already available in the list of provider profiles and the CustomProviderProfiles.config is no longer necessary.


Tested Features

  • Incoming/outgoing national calls
  • Incoming/outgoing international calls
  • Correct Calling Line Identification (CLI) on national and international calls
  • Holding and retrieving calls
  • Toggeling between two calls
  • Call transfer
  • Conferencing
  • Mutually supported codecs:
    • G.711a
    • G.711µ
    • G.729
  • Incoming/outgoing DTMF signaling in accordance with via RFC2833
  • T38 negotiation and FAX transmission


CLIP No Screening: Not supported by VoiceWorks

Test date:
01/10/2012 on SwyxWare2011R2, QF3
04/12/2013 on SwyxWare2013R2
17/06/2015 an SwyxWare2015R2

Further tested SIP providers


As far as software supplied or used by us, includes open source elements the additional terms under apply in addition. An overview which products from the Swyx portfolio include open source elements and which open source license is relevant can be found under

The third-party contact information included in this article is provided to help you find the technical support you need. This contact information is subject to change without notice. Swyx in no way guarantees the accuracy of this third-party contact information nor is responsible for it's content.


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