SIP / Wifi Calling for ICS

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Hi All--

I have configured SIP calling through pbexes.org using the native implementation in ICS

However, I'm running into a little trouble, and was hoping for some help:

Anyone know how to DISABLE sip calling while on 3g, and only have it active on Wifi?

Also, I can only seem to get it to make 'internet calls' (sip) when I have DISABLED calling from google voice. weirdness.

Mine its setup to ask how I would like to make the call, via cellular service or voip.

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