SIP Provider O2 All-IP Voice SIP (DE) (kb5238)

The information in this article applies to:

  • SwyxWare 11

[ Summary | Information | Links ]


Information und configuration hints for SIP provider O2, All-IP Voice SIP (Germany)


General information

The All-IP Voice SIP Trunk from O2 was first tested and released with SwyxWare

The All-IP Voice SIP Trunk from O2 is a SIP Trunk with user authentication, i.e. you receive information on user ID, user name and password. The names may differ, or you may only receive a name or ID with password. In this case the user ID is identical to the user name when configuring the SIP trunk in SwyxWare.

The connection to the All-IP Voice SIP Trunk from O2 can only be made via an Internet connection from O2. For this purpose, the customer receives an Internet router that is integrated into the customer's network. SwyxWare uses this Internet router as a SIP proxy to connect to the All-IP Voice SIP Trunk from O2.


SwyxWare: The All-IP Voice SIP Trunk from O2 can be used from SwyxWare on. When using an earlier version of SwyxWare incompatibilities cannot be excluded and use is at your own risk.

SwyxON: The All-IP Voice SIP Trunk from O2 is not suitable for central connection in the data center. Due to the dependency on the connection, the connection to the SIP trunk must be made locally at the customer's premises via the provided router.


When creating the SIP trunk group, select the profile 'O2 All-IP Voice SIP (DE)'. If the profile is not included in the corresponding list, you can download the required CustomProviderProfiles.config for SwyxWare at the end of this article. For more information about using this file, see Configuration and Adaptation of SIP Providers via Provider Profiles (kb3436).

By using a customer-specific router, it is not possible to preset the entry for the Registrar / Proxy server in the "SIP" tab under the properties of the trunk group. Here you have to enter the IP address of the router.
Session Interval
O2 requires a session interval of at least 1800 seconds for outgoing calls. In the case of a smaller session interval, a corresponding call is rejected. To adjust the default interval of 90 seconds, create the following two registry keys and set them to 1800.

Path (64-bit): HKLM\Software\Wow6432Node\Swyx\LinkMgr\CurrentVersion\Options

Name: SipMinSessionTimerIntervalSeconds, Type: DWORD, Value: 1800 (decimal)

Name: SipSessionTimerIntervalSeconds, Type: DWORD, Value: 1800 (decimal)

After creating the registry keys, the 'LinkMgr' service must be restarted.
Important: This setting affects all SIP trunks.

Fax Transmission

For FAX transmission it is necessary to select the option "Remove T.38 from first negotiation (SIP INVITE)" via the tab "Codecs/Channels" of the properties of the created SIP trunk. .

Tested Features

  • Incoming/outgoing national /international calls
  • Correct Calling Line Identification (CLI) on national / intenational calls
  • CLIP No Screening national
  • Holding and retrieving calls
  • Toggeling between two calls
  • Call transfer
  • Call forwarding
  • Conferencing
  • Mutually supported codecs:
    • G.711a
    • G.711u
    • G.729
  • Incoming/outgoing DTMF signaling in accordance with via RFC2833
  • FAX transmission via T.38/G.711


  • None

Test date
15/04/2019 with SwyxWare

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.


Comment on this article

If we have any follow-up questions, where can we contact you?

E-Mail Address (optional)


This feedback form can't be used for support requests. Those requests must be directed to your Swyx reseller or distributor.