I have several 4602ip phones working well with a 406v2 on 2.1.35 using G.729(a). One site connected via 1500/256 ADSL connection is having problems, whenever he connects an IP phone, we have tested 3 different phones, the phone starts to draw data at such a high rate the DSL connection becomes unusable, ping time rise from 40-50 ms to hundreds and even thousands ms.