Besides these solutions, mostly requiring a constantly running computer, since a wake-on-ring function then (~1995) started to take too much time to boot up an operating system, a few so-called "selfmodems" were available from e.g. USRobotics or ELSA Technology: the "Sportster MessagePlus", the "56K Message Modem External", and the "MicroLink Office". These devices answered incoming calls by playing a welcome message while discriminating fax calls (CNG-tone at 1100 Hz) from voice calls, storing an incoming fax, or a voice message, respectively. A computer was only necessary afterwards to retrieve the faxes, or for storing the voice messages. In case of a full storage the devices changed their welcome message to another, prerecorded message, played upon answering an incoming call, possibly explaining that a message cannot be taken at the present time.