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Sipwise C5 mr10.0.1 Released

We are excited to announce the general availability of the Sipwise C5CE and C5PRO mr10.0.1 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 mr10.0.1?

The most important changes for mr10.0 compared to mr9.5 are:

  • [PRO/Carrier] Switch high-availability subsystem from Heartbeat v2 to Corosync/Pacemaker [TT#79100]

  • New Admin WEB interface used by default (the old UI is still available) [TT#134950]

  • New subscriber and peer preference ‘peer_auth_hf_user’ added to provide the possibility to define a specific username parameter for the Authorization header (affects outbound invitation and registration sessions). [TT#82409]

  • New extending dialing mode option: send primary number with extension [TT#127851]

  • New slot for the Auto-Attendant’s drop-down menu. Now there is a possibility to define the ‘default’ action. [TT#133301]

  • [PRO/Carrier] Reworked Push to Mobile feature in order to support parallel ringing of deskphones and mobile app users. [TT#110504]

  • [PRO/Carrier] New config.yml options to enable/disable sending a 18x message to the caller while sending the PUSH notification. In this way the caller will hear a fake ringing while the mobile app is wakening. The new preferences are the following: ‘kamailio.proxy.push.reply_18x’, ‘kamailio.proxy.push.code_18x’ and ‘kamailio.proxy.push.reason_18x’. [TT#110504]

  • Reworked codec negotation logic when transcoding for improved interoperability and media flows with consistent codec usage. [TT#112700]

  • [PRO/Carrier] The new push mechanism doesn’t involve SEMS anymore but it is mainly implemented in Kamailio Proxy instance. [TT#110504]

  • [PRO/Carrier] New kamailio modules enabled for mobile push feature: ‘dmq’ and ‘tsilo’ [TT#110504]

  • [PRO/Carrier] Sound set handle ‘push_connecting’ is not used anymore to generate a fake ringback tone or announcement to the caller while the mobile app is wakening. Please see instead the new config.yml options under ‘kamailio.proxy.push’. [TT#110504]

See the list of all changes in PDF Changelog mr10.0.1

What is mr10.0.1?

The build mr10.0.1 is the first build for release mr10.0, mr10.0.1 provides new features and bugfixes.

Is mr10.0.1 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-0128aefc63c41802b
  • AMI ID for region ap-southeast-1: ami-061110d5df8da59ce
  • AMI ID for region ap-southeast-2: ami-0abe600352fa49d7e
  • AMI ID for region eu-central-1: ami-035ddd1093b816f4b
  • AMI ID for region eu-west-1: ami-081870032fb1e1538
  • AMI ID for region sa-east-1: ami-0592b9891204c3ae1
  • AMI ID for region us-east-1: ami-0c6ac2b782e8674db
  • AMI ID for region us-west-1: ami-05898e3852211dda4
  • AMI ID for region us-west-2: ami-00fd9834732d7b870

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 mr10.0.1 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!