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
There are basically three different scenarios here
Use of a Telekom Internet access (Telekom Busines DSL products, MagentaHome DSL products,...)
The name of the outbound proxy must be resolved via the Telekom DNS server. This is communicated by Telekom to the customer's router as part of the DSL connection setup (via PPPoE).
Use of symmetrical Telekom access products (Business Premium Access, DeutschlandLAN Connect IP, Company Connect)
The name of the outbound proxy must be resolved via the associated Telekom DNS servers of the access product, which are communicated to the customer by Telekom when the contract is concluded.
In contrast to DeutschlandLAN Connect IP and Company Connect, Business Premium Access offers a QoS Voice class in conjunction with the Voice VLAN and the Data VLAN.
Use of an Internet connection that is not provided by Telekom (third-party connection)
The DNS server of the third-party network provider should primarily be used on the third-party access.
The DNS server of the third-party network provider must support the so-called "ECS" feature.
If the DNS resolution fails, we recommend using the BPA DNS server.
BPA DNS Server
| Standort | IPv4 Adresse | IPv6 Adresse | Reverse Lookup Name |
| Frankfurt | 194.25.0.70 | 2003:40:2000::0B9A | resolvbpa-f.t-ipnet.de |
| Hannover | 194.25.0.62 | 2003:56::0B9A | resolvbpa-h.t-ipnet.de |
| Leipzig | 194.25.0.54 | 2003:40:4000::0B9A | resolvbpa-l.t-ipnet.de |
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.
Important: From SwyxWare 12.00.0.0 a Call & Surf profile with encryption via TLS is available. To use this profile it is necessary to import the Telekom Root certificate into the Windows Certificate Store of the SwyxWare server. Further information can be found in the download link at the end of this article.
A detailed configuration guide (in German) can be downloaded at the end of this article.
Tested Features
- Incoming/outgoing national calls
- Incoming/outgoing international calls
- Correct Calling Line Identificaion (CLI) on national and international calls
- Holding and retrieving calls
- Toggeling between two calls
- Call transfer
- Conferencing
- Mutually supported codec: G.711a
- Incoming/outgoing DTMF signaling in accordance with via RFC2833
- FAX transmission via G.711
Restrictions
CLIP No Screening is not supported
Test date
27/04/2015 with SwyxWare2015 R2 with CHF
28/09/2015 with SwyxWare2015 R3
11/12/2019 with SwyxWare 12.00.0.0 (TLS Profile)
Disclaimer
Verifying interoperability between different SIP providers and the Swyx solution is part of the Enreach Technology Alliance Programme (TAP) tasks. Due to different implementations of the SIP RFCs, it is necessary to determine and provide an individual configuration for each SIP provider.
Within the TAP, Enreach tests a large number of national and international SIP providers in order to make statements about the interoperability with the Swyx solution and the functional scope of the respective SIP trunk. These results and, if needed, configuration advice are published in Help Center articles.
Enreach is in close contact with selected SIP providers to ensure a quick troubleshooting in case of incompatibilities. In addition, tests are repeated at regular intervals to ensure consistent quality.
Despite regular retests it cannot be excluded that incompatibilities with the Swyx solution may occur due to changes in the SIP connection on the provider side or that the provided profile is no longer valid. After creating the trunk group or SIP trunk, the profile settings should be compared with the provider's information and adjusted accordingly in case of deviations.
However, should incompatibilities or problems occur with a tested SIP trunk, no claims for recourse against Enreach GmbH can be derived from this. In such cases, you can contact Enreach Support via your specialist dealer.
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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