Yahoo! Voice is a Voice over IP PC-PC, PC-Phone and Phone-to-PC service , provided by Yahoo! via its Yahoo! Messenger instant messaging application. Yahoo! Voice uses the Session Initiation Protocol (SIP), GIPS codec and the Dialpad engine for voice transport. Since 2008 the service has been provided by JAJAH, an outsourced VoIP provider.

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, specially referring to the packet scheduling service (be it over a cable, over the air, etc), introduce a problematic operation since end users do not always count with last mile access networks that provide real time packet scheduling, which means a prioritized and very shortly delayed transmission of data, which is needed to the perception of a natural communication with no delays or holes; In contrast the vast majority of users have Best Effort packet scheduling services (most of the operators who provide ADSL, wifi, wimax, satellite without implying that those technologies are restricted, only the business models are) for all their data transmission needs and therefore when the demand of other users is high or the over the air conditions (radio signal strength/interference ratio/BER) are not met the communication is felt delayed, cut, bad quality; But this Behavior is not VoIP Solution specific problem but business specific or access technology specific (in the case certain technical aspects must be met for an always non-delayed data transmission), therefore the same problems are found in any other type of VoIP solution.

Adil or Adel Shah Afshar, born ʿAlī-qolī Khan (Modern Persian: عادل شاه افشار) (died 1749) was the Afsharid Shahof Iran from 1747 to 1748, a nephew and successor of Nader Shah, the found of the Afsharid dynasty.

Ali-qoli khan was the eldest son of Nader's brother, Ebrahim Khan. Nader appointed him governor of Mashad in 1737. In the same year he married Princess Ketevan, daughter of the Georgian king Teimuraz II, Nader's ally. In 1740 he was also married to a daughter of Abu'l-Fayz, ruler of recently subdued Bokhara.

From 1743 to 1747, Ali-qoli khan commanded Nader's troops against the Yazidis of Kurdistan, the Karakalpaks and Uzbeks of Khwarazm and in Sistan. He then ran afoul with his uncle over the letter's decision to levy 100,000 tomans on him and Nader's suspiciousness. In April 1747, Ali-qoli khan, in conjunction with the rebels of Sistan, occupied Herat and induced the Kurds into rebellion. Nader, on his march against the insurgents, was murdered by a group of his officers, who offered the crown to Ali-qoli.