- IMSZone
- Diameter Stack
- Home Subscriber Server
- Online/Offline Charging System
- Media Server
- OAM&P
- Open IMS Playground - FOKUS
- OpenSER
- OpenSIPs
- SER
- OpenIMS Core - FOKUS
- SEMS – SIP Express Media Server
- CallWeaver
- OpenIC
- IMS Communicator - sip-communicator
- UCT IMS Client
- OpenDiameter
- JDiameter
- SIPP
- OpenFire
- Kannel
- MBuni
- OpenVXI
- Asterisk
- SIPfoundry SipX
- YATE
- FreeSWITCH
- Bayonne
- Vovida Vocal
- SIPSEE
- SailFin
- MobiCents
- WeSIP
- MiniSIP
- X-Lite
- SJphone
- Kapanga
- Sipp
- OpenBloX
- Open Sip Stack
- Jain-sip
- PJSIP
- OPAL
- SipX
- reSIProcate