Hosted PBX providers' pricing structures vary widely. In general, however, the more features you get, the more expensive the service. For example, some providers offer "unlimited" calling plans that charge higher rates for international calls or cheaper domestic calls. Other providers offer flat-rate plans with unlimited calling to domestic and international numbers. Hosted PBX providers also charge extra fees for additional features such as voicemail transcription (which converts voicemails into text), fax-to-email capabilities or call forwarding to mobile phones or landlines outside of your office's local area code. Some providers offer discounts if you purchase multiple lines or services at once; others offer promotional rates.