Hi Ringroost,

I have an iPhone 3GS that is no longer under contract with anyone. I do not have a SIP phone and wireless ones are not cheap. So I would like to use the iPhone as a way I can make calls via Voip when I am at home through my wifi. I would also like to interface it to my PABX with you. Can you please suggest which app I should install on my old iPhone so I can use it with your system?

Thanks in advance....ianT

Hi Ian.

Zoiper is probably going to be your best for making SIP calls on your iPhone.

You can see how to use with RingRoost here: https://www.ringroost.com/blog/registering-a-zoiper-softphone-with-ringroost/