MORPhoneBy KOLMISOFT ( Free )
It is a generic SIP client for iPhone/iPod/iPad Supported Audio Codec: G.729, G.711 |(PCMA , PCMU), G.722 , G.729, GSM, Speex (8Khz), AMR-NB-OA, AMR-NB- BE Supported Video Codec: H.263, H.263-1998, H.264-BP10,H.264-BP20, H.264-BP30, Theora, MP4V-ES, VP8 Video will work on the ...