SIP Provider Deutsche Telekom, Call & Surf Connection (DE)

General

The Deutsche Telekom is offering the possibility to perform telephony on a SIP base to their private customers, when using their Call & Surf connections. This is not a traditional SIP trunk, but nevertheless the SwyxWare can be configured accordingly use this connection for telephony. This can only be used when it is combined with internet access from Deutsche Telekom, it cannot be used an any other internet connection.

DNS configuration

Basically the DNS server of the respective Internet access provider should always be entered on the SwyxWare server (or router).

DNS in the VoIP environment for Telekom connections

For Telekom connections with PPPoE dial-up (xDSL), these are automatically assigned when dialing in. For CompanyConnect (CoCo)/GermanyLAN Connect IP (DCIP) as well as for Business Premium Access (BPA) these are stored on the customer letter. There must be no confusion between CoCo/DCIP and BPA DNS servers!

The DNS server for the respective product must always be used. In the worst case, incorrect configuration can lead to SIP trunks not being registered, to temporary problems (e.g. dropped calls) or to Quality of Service (QoS) not working. The customer should therefore know whether he has a CoCo, DCIP or BPA.

Platforms

SwyxWare

The Call & Surf connection from Deutsche Telekom can be used according to the settings listed below from SwyxWare2015 R2 on. If you use an earlier version of SwyxWare, incompatibilities cannot be excluded and you are responsible for your own usage.

SwyxON

The Call & Surf connection of Deutsche Telekom can be terminated locally at the customer's premises via a corresponding gateway and connected to the data centre via a gateway line.

Configuration

Required information:

• Access number (previously T-Online Number) or its alias, i.e. 11223344
• Personal password for the Telekom SwyxWare2015 R2 connection
• assigned numbers (usually threei), i.e.. 040112233, 04011223334, 040112235

These information is provided by Deutsche Telekom when the connection is created or can be accessed through the Telekom customer center.

For each single assigned number, a dedicated SIP trunk group with the profile  "Telekom Call and Surf (DE)" must be created. When configuring the user data for each SIP trunk, the associated public number must be entered as User ID in format canonical with plus, i.e. +4940112233. As UserName, the Access number must be configured. In order to enable forwarding of inbound external calls to another external destination, the number of simultanous call on each trunk must at least be '2'.

After the public calling number was assigned to a user, the exclusive usage of this trunk for that specific user must be configured through the routing records of the SIP trunk.

If an external, inbound call needs to be forwarded to another external destination, it is necessary to signal the public number of the forwarding party. This has to be configured in the tab 'NUmber signaling' of the trunk properties (Use: Originator's number, if assigned to this trunk, otherwise: Number of the transferor.)

During creation of the actual trunk, in the codec configuration dialog, T.38 has to be deselected as supported codec. This step could also be performed afterwards in the properties of the SIP trunk, underneath the 'Codecs' tab.

Tested Features