Toktumi, makers of the VoIP system Line2 are requesting users not upgrade to iOS 4.2 due to a known bug with VoIP. In an email sent to registered users, the company claimed that iOS 4.2 has a bug in the system, where if you’re running Line2 in the background, the ringer will continue to sound after you’ve answered the call. Here’s the email they sent out:
Attention all Line2 iPhone, iPod Touch, and iPad users:
Please do not upgrade to iOS version 4.2
If you upgrade to iOS 4.2 and you are running Line2 in the background, the ringer will continue to ring even after an incoming call is answered. This affects Line2 as well as all other VoIP and social calling apps. (Note: If you do not use Line2 your Toktumi service will not be effected.)
Apple Developer Support is aware of this issue and has designated its status as ‘severe’. Apple released a new Golden Master to developers of iOS 4.2.1 today. http://www.informationweek.com/news/smb/mobile/showArticle.jhtml?articleID=228300189
We are currently testing the new release and will provide an update on results shortly. Until then we please do not update to iOS 4.2.
Line2 will continue to work as normal with your current operating system. We strongly encourage you not to install iOS 4.2 until Apple fixes the upgrade issue. We will send out an email update as soon as it is safe to upgrade.
The Toktumi/Line2 Team
It sounds a bit like this problem might hit other VoIP apps too, so keep an eye on Skype and Fring when the OS upgrade lands.