Free VoIP SIP clients

Here the pros and cons of free VoIP/SIP clients are discussed.

VoIP/SIP Windows clients

MicroSIP

Open source portable SIP softphone based on PJSIP stack for Windows OS.

VoIP/SIP Android clients

baresip+

Portable and modular SIP User-Agent with audio and video support.

Calls

SIP VoIP Softphone.

Zoiper

FREE IAX and SIP softphone application for voip calls over 3G or WiFi. There are NO ADVERTISEMENTS.

Please note that Zoiper offers mandatory SRTP but not optimistic SRTP, so you must set media_encryption_optimistic=no in pjsip_wizard.conf if you plan to use SRTP.