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Sipwise C5 mr7.2.2 Released

We are excited to announce the general availability of the Sipwise C5CE and C5PRO mr7.2.2 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 mr7.2.2?

The most important changes for mr7.2 compared to mr7.1 are:

  • [PRO/Carrier] Add call cost rating support for transit calls [TT#44911]
  • [PRO/Carrier] Add sudo plugin to ask user for justification before elevating privileges due to GDPR requirements [TT#47112]
  • [PRO/Carrier] Header Manipulations now support individual per subscriber rules creation [TT#47010]
  • Secure all config files for passwords leakage (root only can read them now) [TT#50100]
  • Automatically correct invalid SDP bodies in rtpengine for hold [TT#48708]
  • Improve customer-self-care panel design and usability [TT#44752]
  • Allow playing a pre-recorded greeting to the calling party before answering the call [TT#45616]
  • Allow playing a pre-recorded message to the calling party if call recording is active [TT#45614]
  • Support sound sets on peerings for failed incoming calls from the peer [TT#47535]
  • Add new subscriber/domain preferences to filter SDP codecs by ID [TT#50955]
  • Rework CFR to be assigned to the callee subscriber instead of caller [TT#53850]
  • Add new config.yml option to allow custom headers to be passed through [TT#47008]
  • Allow multi-device handling via Alias Numbers on registration for calls, by optionally treating the Display-Name in registrations as device-id, and explicitly route calls to this single device if called via that specific Alias Number, instead of parallel forking to all registered devices. [TT#51168]
  • Refactor cluster_sets definition in config.yml [TT#48593]
  • Upgrade kamailio to version 5.1.7 [TT#51903]
  • Upgrade Sipwise GRML to fix EFI boot on some hardware [TT#49212]
  • Move /var/sipwise to the ngcp-data partition [TT#49058]
  • Rotate log files on maxsize threshold [TT#50980]
  • Add iCalendar support and improved UI interface for the TimeSets configuration [TT#47534], [TT#49689]
  • Add reseller preferences support for csv separators per reseller and .csv numbers normalisation using a rewrite rule set [TT#46955], [TT#54204]

See the list of all changes in PDF Changelog mr7.2.2

What is mr7.2.2?

The build mr7.2.2 is the last build for supported non-LTS release mr7.2, mr7.2.2 provides new features and bugfixes.

Is mr7.2 LTS (long time supported) release?

No. Release mr7.2 is no longer supported as build mr7.2.2 has been published. 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 us-east-1: ami-07e672cc878f9d903
  • AMI ID for region us-east-1: ami-098bb623c57083f3a
  • AMI ID for region us-west-2: ami-099f49d1128137428
  • AMI ID for region us-west-1: ami-0578f8f3f4f295da5
  • AMI ID for region eu-central-1: ami-0f0f89995f5007b71
  • AMI ID for region eu-west-1: ami-035a829cbf4ec07c2
  • AMI ID for region ap-southeast-1: ami-0e48e698b11cf5395
  • AMI ID for region ap-southeast-2: ami-06d7cc735eeea82ba
  • AMI ID for region ap-northeast-1: ami-0df0fd4a25b68f05c
  • AMI ID for region sa-east-1: ami-07f806bbef91ce7fe

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 mr7.2.2 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!