Hello,
We have around 6 years of experience in VoIP/ Messaging apps development. We can definitely do this project. We have develop dialers with support for call through. We have developed SIP dialers using G729, G711, GSM codecs for IP-IP and IP-GSM calls.
We have developed " United Communication Dialer" for iPhone, Android, Blackberry, Symbian, Windows Mobile and Windows Desktop Platform with technical Features Like:
1) VoIP calls based on SIP protocol. VoIP includes peer to peer calls and IP-GSM.
2) Support for G729, GSM, G711 u/a codec.
3) Loudspeaker and Mute Support
4) IP calls get disconnected in case of incoming GSM call.
5) Instant Messaging using XMPP protocol with support for Facebook/Yahoo/MSN/ICQ and Gtalk Chat.
6) Instant Messaging using SIMPLE Protocol.
7) Add and Delete Friends
8) Buddy List management
9) Presence Management of Contacts
10) Ability to set presence
11) Bandwidth Indicator using SIP Options Packet. IP calls will be routed to Callthrough in
case the available bandwidth is low.
12) Call Back. We have developed this module as a separate application. It can be
integrated with Communication Dialer.
13) Call logs with support for Dialed, Missed and Received calls.
We have been in mobile app development since 2008 and have a team of 30 dedicated engineers. Some of our privileged customers include BMW, Telecom Malaysia,Unison,Core Telecom UK, Airtel, Ford and others.
We can further discuss the contours of the association.
Thanks
Shubh