IMSDroid is the first fully featured open source SIP/IMS client for Android. It is also the only free Android SIP client which supports direct Video Calls.
3GPP IMS (IP Multimedia Subsystem) is the next generation network for delivering IP multimedia services. IMS is standardized by the 3rd Generation Partnership Project (3GPP). IMS services could be used over any type of network, such as 3GPP LTE, GPRS, Wireless LAN, CDMA2000 or fixed line.
The current version of IMSDroid partially implements GSMA Rich Communication Suite release 3 and The One Voice profile V1.0.0 (LTE/4G, also known as GSMA VoLTE) specifications.
AstraChat - Direct XMPP & VOIP Client AstraChat is a standalone and lightweight Jabber (XMPP) client application with VOIP calling that connects directly to your XMPP server without any proxies in-between
Google Voice Place calls and send text messages showing your Google number
YouMagic YouMagic provides free IP calls within a domestic network and cheap long-distance and international communication
Skype (Android) With the Skype app, you can make free Skype-to-Skype calls, and send and receive IMs for free, one-to-one or with a group
Yelo : Cheap Calls Worldwide Use the Yelo App to make cheap calls to anyone, anywhere in the world on their normal mobile or fixed landline numbers. No more shock phone bills!
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Comments on IMSDroid:
Date: 1 Jan 13
with app works great I used the StardeTalk Sip account it support Video, and works in blocked countries you can register you account at sip.stardextalk.com/onlineshop the ip address is 18.104.22.168 then enter the username and password you registered with
Date: 8 Feb 12
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