Yahoo! Phone Out
PC-to-Phone calls to landlines and mobile phones with the Yahoo! Phone Out service (charges apply). Conference calls from PC to Multiple (PSTN) phones or mobiles is currently not supported.
The limitations imposed by packet switched networks, specifically referring to the packet scheduling service (be it over cable, over the air, etc.), introduce a problematic operation since end users do not always use networks that provide real time packet scheduling. This means no priority and significant delays in transmission of data, which causes delays or "holes" in a conversation. The vast majority of users have best effort packet scheduling services for all their data transmission needs and therefore when user demand is high, or the over the air conditions (radio signal strength, interference ratio and BER) are poor, the conversation appears delayed, cut, bad quality, etc. This behavior is not a VoIP specific problem, but business specific or access technology specific (certain technical aspects must be met for non-delayed data transmission), therefore the same problems are found in any type of VoIP solution.
Read more about this topic: Yahoo! Voice
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