Analog Adapter – this is a device used for connecting one or several standard analogue telephones to digital telephone communication systems (for example, VoIP) or non-standard telephone systems.
Voice over IP gateway VG200 was specially created for Cisco AVVID (Architecture for Voice, Video and Integrated Data) Call Manager. This device was not meant to support add-ons, such as toll bypass using H.323 protocol or SIP gateways.