Analog telephones have terrible bandwidth. Just 300–3,300 Hz. This it technically called the voiceband, but it cuts off a good portion of female speech. Also,

Analog telephones have terrible bandwidth. Just 300–3,300 Hz. This it technically called the voiceband, but it cuts off a good portion of female speech. Also, all phone lines these days, wether POTS or VOIP are digitally trunked and switched.