Adventures in VoLTE:

The open-source VoLTE deployments in Bulgaria and South Africa

A little history...

2010: Merge OpenIMSCore into Kamailio

2011: Smile Telecoms joins the development

2013: Early deployments in fixed networks

2015: First VoLTE networks! :-)

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Who's involved?

Max Telecom (Bulgaria)The first LTE Operator in Bulgaria!

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Smilecoms (South Africa)LTE Operator in South Africa, Nigeria, Uganda and Tanzania

ng-voice (Germany)Member of the Kamailio-Management-Team

And of course the open-source community!!!

Launch:Q1/2015

What do we want to achieve?

VoLTE Telephony – for real VoLTE Handsets a VoLTE based SMS-Service (3GPP SMS) an OTT-Voice-Service

– for non VoLTE, 4G-Handsets an OTT-SMS-Service (SIP-Message) Wifi Offloading

should run virtualized, where possible (NFV)

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What are we not aiming at (yet)?

JOYN

Single Radio-Voice Call Continuity (SRVCC)

WebRTC

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Kamailio – as the IMS-Core SEMS (or other SBC) for Topology Hiding

and Transcoding Kamailio and/or Freeswitch as the MMTel

HSS: Any HSS will do (Standard Cx/Dx-Interface) PCRF: Any PCRF will do (Standard Rx-Interface) Charging: Any OCS will do (Standard Ro-Interface)

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Our Architecture: Voice

Our Architecture: SMS

Option 1: Kamailio as the SMS-AS: Kamailio – as a translator between 3GPP/SMS

(VoLTE) and plain SIP-Message (OTT) as a gateway towards e.g.

Kannel (www.kannel.org)Mobicents SMSC (code.google.com/p/smscgateway)

Option 2: Add 3GPP-SMS to Mobicents

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Our Architecture

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Alternatives? (1)

OpenVoLTE – Yate/YateBTS

has an SRVCC implementation- no real IMS – just a „lightweight IMS emulation“- no Rx-Interface – we cannot connect to a PCRF- no Ro-Interface for online-charging- not really open-source, only parts

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Alternatives? (2)

Project Clearwater (Metaswitch)

- is no real IMS – various interfaces are using HTTPinstead of Diameter

- no Rx-Interface – we cannot connect to a PCRF- no Ro-Interface for online-charging

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Current challenges

SMS-Implementation - Voice is easy ;-) SMS-OTT-Interworking??

Patent issues for AMR-NB – sorted out

Test, Test, Test!

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Thank you!Contact: www.ng-voice.com - carsten@ng-voice.com