This document describes configuring the Ribbon Session Border Controller (SBC) 1000/2000 series when connecting to Deutsche Telekom. For additional information about Ribbon SBCs, visit https://ribboncommunications.com/.
The interoperability compliance testing focuses on verifying inbound and outbound call flows between the Ribbon SBC 1000 / 2000 and Deutsche Telekom "DeutschlandLAN" SIP trunks.
This technical document is provided for use by telecommunications engineers and network administrators that understand networking concepts such as TCP/UDP, IP/Routing, and SIP/RTP, along with experience using industry-standard utilities and tools. The information in this guide describes configuring and operating Ribbon SBCs. Some information describes using third-party products when administering and troubleshooting SBC operation.
This configuration guide is offered as a convenience to Ribbon customers. The specifications and information regarding the product in this guide are subject to change without notice. All statements, information, and recommendations in this guide are believed to be accurate but are presented without warranty of any kind, express or implied, and are provided “AS IS”. Users must take full responsibility for the application of the specifications and information in this guide.
The following equipment and software are used in the reference configuration:
Ribbon SBC 1000
The following reference diagrams show connectivity between the Ribbon SBC 1000 / 2000 and third-party equipment that interoperates with the SBC. In this IOT we have two SIP trunks configuration:
2. SIP Trunk Pure:
In both cases the general setup is the same, except the ISP is a different one.
For questions about information in this document, contact Ribbon Support in either of the following ways:
The following steps provide an example of how to configure the Ribbon SBC 1000/2000.
Select Settings > Media > Media Profiles.
Media Profiles specify the individual voice and fax compression codecs and their associated settings for inclusion into a Media List. Different codecs provide varying levels of compression, allowing the reduction of bandwidth requirements. We deactivated CNG/Fax Tone. Listed below are the media profiles of the voice codecs used for testing the SBC 2000:
The Digit Relay Payload Type must be set to 101.
Rule is applied as OUTPUT message manipulation in signaling group sgTELEKOM.
Example rule for URI hostname:
If you do not configure the "Message Manipulation Table" settings listed in the next image, you will experience faulty calls (1-way audio, then cancel after 10 seconds) for outgoing calls to mobile phones in the Deutsche Telekom network because in PRACK packets, the request URI is also handled unless you limit the table to Register & Invite.
Select Settings > SIP > Remote Authorization Tables.
Remote Authorization Tables entries contain information for responses to request message challenges by an upstream server.
Select Settings > SIP > SIP Server Tables.
SIP Server Tables contain information about the SIP devices connected to the SBC Edge. The entries in the tables provide information about the IP Addresses, ports, and protocols used to communicate with each server. The table entries also contain links to counters that are useful for troubleshooting.
When you configure a SIP server table entry with a DNS SRV record, Ribbon recommends that you do not configure another SIP server table entry with the IPs or FQDNs that the DNS SRV record resolves.
The SBC does not configure two Signaling Groups (SG) that face the same SIP server with a different Load Balancing setting, especially if the SIP server is sensitive on the SBC connection information (that is, the IP and port number of the SBC to send SIP messages).
Select Settings > SIP > SIP Profiles.
SIP Profiles control how the SBC Edge communicates with SIP devices. The SIP Profile controls important characteristics such as the following: session timers, SIP header customization, SIP timers, MIME payloads, and option tags.
Contact Registrant Tables manage contacts that are registered to a SIP server. The SIP Server Configuration can specify a Contact Registrant Table. The username portion of the table is used for outbound calls.
This section is not applicable.
Select Settings > Signaling Groups.
Signaling groups allow telephony channels to be grouped together for the purposes of routing and sharing configuration data. Calls are routed to signaling groups along with the location data used in Call Route selection. A signaling group also specifies the location from which Tone Tables and Action Sets are selected. For SIP, signaling groups specify protocol settings and link to server, media, and mapping tables.
There is a known limitation in cases where the ISP cuts the internet connection approximately every 24 hours and reassigns the IP.
When the ISP cuts the internet connection and changes the public IP, which can occur every 24 hours for some ISPs, the following has been observed:
Based on that, we recommend to configure the DSL modem so that the time when the internet connection or change of public IP address happens during the out of office hours or low traffic hours.
This section is not applicable.
These Application Notes describe the configuration steps required for Ribbon SBC 1000 / 2000 to successfully interoperate with Deutsche Telekom. All feature and serviceability test cases were completed and passed with the exceptions/observations noted in Test Results.