Talkonaut for Android does support Speex (also many other codecs including G.729 through GTalk2VoIP gateway), it is not as complex in setup as Sipdroid. And you

Talkonaut for Android does support Speex (also many other codecs including G.729 through GTalk2VoIP gateway), it is not as complex in setup as Sipdroid. And you are right, it's easier to obtain free ipkall DID then point it to any SIP URI you like. Wonder how soon Google bans ipkall for breaking their business model :-).