iMPcP app for iPhone and iPad

iMPcP is an internet communication utility based on End-to-End transmission.
Comply with RFC 3261 Session Initiation Protocol.
Run in background.
Support TCP and UDP protocols.
Support Custom Sip Provider.

Features:
(1) Support wifi and 3G network
(2) Support SIP Call
(3) Support Text Instant Messaging (for default sip provider only)
(4) Support 30 seconds Voice reconding Instant Messaging (for default sip provider only)
(5) Support Image Instant Messaging (for default sip provider only)
(6) Support Handwritting Note Instant Messaging (for default sip provider only)
(7) Support in-band DTMF Digits (via RTP)
(8) Support Traversing NAT/Firewall

To fully achieve these features, we recommend you to choose default sip provider.