In that case I would guess there is some sort of problem with that app. As mentioned above, I am using the media5 voip app (also available in the itunes store) and the application works flawlessly - including multitasking.
Just as a suggestion, media5 offers a free lite version of the app that...
Have you updated to the latest version of iSip, or is this an older version of the app you download some time ago? Apple released multitasking ability several months ago but app developers were forced to add the function to their apps for multitasking to work.
I just did a search for iSIP in...
I would just like to clarify, contrary to what cknipe said, that multitasking is in fact available on the iphone 3GS with the latest iOS update (4.1). I have been using a SIP iphone app called media5 VOIP with the mitel 3300 MCD4 and an iphone 3GS for a few months now with great results! I have...
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