SIP Provider NetCologne (DE) (kb4480)

The information in this article applies to:

  • SwyxWare 2015

[ Summary | Information | Links ]


Information und configuration hints for SIP provider NetCologne (Germany).


General information

NetCologne 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. 


During creation of the SIP trunk group, profile 'NetCologne (DE)' must be selected.
After creation of the actual SIP trunk, it is necessary to configure the IP address and port that were specified by NetCologne for Registrar and Proxy in the SIP tab of the properties of the SIP trunk group.
In case that the SwyxWare server is running with a private IP address and the 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


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: +49 221 1234560 ... +49 221 1234569
In this case, the SIP URI must be entered in the format +49221123456*@*.
The mutally supported codecs are G711A and T.38. In the tab 'Codecs/Channel' of the SIP trunk properties only these two codecs have to be selected. Additionally, the option 'Remove T.38 codec from initial invite' has to be selected in order to assure a sucessful T.38 negotiation and FAX transmission.
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).

Tested Features

  • Incoming/outgoing national calls
  • Incoming/outgoing international calls
  • Correct Calling Line Identification (CLI) on national and international calls
  • CLIP No Screening
  • Holding and retrieving calls
  • Toggeling between two calls
  • Call transfer
  • Conferencing
  • Mutually supported codecs:
    • G.711a
    • T.38 for FAX negotiation
  • Incoming/outgoing DTMF signaling in accordance with via RFC2833
  • T.38 Negotiation and FAX transmission

Test date:
05/11/2014 with SwyxWare 2015
26/05/2017 with SwyxWare 2015 R40.2

Overview of tested SIP provider


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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