back to all Sipwise CE - News

Sipwise C5 mr9.1.1 Released

We are excited to announce the general availability of the Sipwise C5CE and C5PRO mr9.1.1 release.

What is the Sipwise C5 platform?

Sipwise C5 PRO Architecture Overview

The Sipwise C5 platform is a highly versatile open source based VoIP soft-switch for ISPs and ITSPs to serve large numbers of SIP subscribers. It leverages existing building blocks like Kamailio, Sems and Asterisk to create a feature-rich and high-performance system by glueing them together in a best-practice approach and implementing missing pieces on top of it. Sipwise engineers have been working with Asterisk and Kamailio (and its predecessors SER and OpenSER) since 2004, and have roles on the management board of Kamailio and are contributing to these projects both in terms of patches and also financially by sponsoring development tasks. The Sipwise C5 platform is available as a Community Edition (CE), which is fully free and open source, and as a commercial PRO appliance shipped turn-key in a high availability setup. The Sipwise C5 provides secure and feature-rich voice and video communication to end customers (voice, video, instant messaging, presence, buddy lists, file transfer, screen sharing, remote desktop control) and connect them to other SIP-, Mobile- or traditional PSTN-networks. It can therefore act as open Skype replacement system, traditional PSTN replacement, Over-The-Top (OTT) platform and also as a Session Border Controller in front of existing VoIP services in order to enable signaling encryption, IPv6 support, fraud- and Denial-of-Service prevention. Another use-case is to act as a Class4 SIP concentrator to bundle multiple SIP peerings for other VoIP services.

What’s new in mr9.1.1?

The most important changes for mr9.1 compared to mr9.0 are:

  • Improve support for AMR and AMR-WB transcoding options, including enhanced audio quality control and adaptive mode switching. [TT#99250] [TT#92701] [TT#91003]
  • Improve codec negotiation capabilities when transcoding, including better handling of supplemental codecs (DTMF) and matching codec format parameters in an answer [TT#92250]
  • Add option to respond with just a single codec for endpoints that require this [TT#92250]
  • Add support for additional hashing functions for DTLS fingerprints (e.g. SHA-256) [TT#97302]
  • Add new option to honour a remote client’s preference for ICE usage [TT#94201]
  • Add new subscriber’s preference lookup_all_registrations. CloudPBX module is required. [TT#97750]
  • Remove obsolete MPT RAID support. [TT#98651]
  • Add new subscriber’s location mapping definition. It substitutes the existing location_from_subscriber and location_from_subscriber_mode preferences. [TT#101300]
  • [PRO/Carrier] Add a new SNMP OID for SIP responsiveness. [TT#99003]
  • [PRO/Carrier] Reorganize current and deprecate legacy SNMP OIDs. [TT#90600] [TT#99002] [TT#99100]
  • [PRO/Carrier] Add PBX SNOM devices autoprovisioning: D715, D717, D735, D785, M900 [TT#91508]
  • [PRO/Carrier] Add support for configure codecs list and order in SEMS TPCC generated calls. [TT#91551]
  • [PRO/Carrier] Add possibility to register devices with username=alias if the alias is flagged as is_devid. Calls directed to the aliased number reach the device directly. CloudPBX module is required. [TT#97750]
  • [Carrier] Add ability to troubleshoot calls from/to specific subscribers sending SIP messages to an inactive proxy node. [TT#93950]

See the list of all changes in PDF Changelog mr9.1.1

What is mr9.1.1?

The build mr9.1.1 is the last build for release mr9.1, mr9.1.1 provides new features and bugfixes.

Is mr9.1 LTS (long time supported) release?

No. See the release calendar on

How do I test-drive the new version?

As usual, we’re providing a VMWare Image, a Virtualbox Image and a Vagrant Box for quick evaluation testing. For those of you using Amazon Cloud we provide the EC2 AMIs in the following regions:

  • AMI ID for region ap-northeast-1: ami-06327aa4ce0336e13
  • AMI ID for region ap-southeast-1: ami-0e2df1e79ac277a31
  • AMI ID for region ap-southeast-2: ami-03061df042e97e6c9
  • AMI ID for region eu-central-1: ami-034d22364600165d6
  • AMI ID for region eu-west-1: ami-0cea10a4e7c2dfcdb
  • AMI ID for region sa-east-1: ami-060bac4d4d96c9546
  • AMI ID for region us-east-1: ami-071b99886827a55e2
  • AMI ID for region us-west-1: ami-04aef98fdc39d2147
  • AMI ID for region us-west-2: ami-06842cbdb74e31758

Check the relevant section in the Sipwise C5 CE Handbook for detailed instructions.

How do I install the new version or upgrade from an older one?

For new users, please follow the Installation Instructions in the Handbook to set up the Sipwise C5 CE mr9.1.1 from scratch. For the users of the previous version of Sipwise C5 CE, please follow the upgrade procedure outlined in the Handbook. If you have customized your configurations using customtt.tt2 files, you must migrate your changes to the new configuration files after the upgrade, otherwise, all your calls will most certainly fail. Hint: modern patchtt.tt2 framework can help you here in the future.

How can I contribute to the project?

Sipwise is publishing software components at Please check it regularly for new projects to appear there, and feel free to fork them and send us pull requests. For development related questions, please subscribe to our Dev Mailing-List at


We want to thank our PRO/Carrier customers and the Sipwise C5 CE community for their feedback, bug reports and feature suggestions to make this release happen. We hope you enjoy using our software and keep your input coming. A big thank you also to all the developers of Kamailio, Sems and Prosody, who make it possible for us to provide an innovative and future-proof SIP/XMPP engine as the core of our platform! And last but not least a HUGE thank you to the Sipwise development team, who worked insanely hard to create this release. You are awesome!