Will this supply power to analog phone through the phone cable - like a landline did in the past?

No, the provided information does not mention the ability to supply power to an analog phone through the phone cable.

does this take a cable from my internet provider is is supplying VOIP to my current landline? the looks of the plugs it seems so..

Yes, the ANALOG TELEPHONE ADAPTER (model GS-HT802) has one 10/100 Mbps auto-sensing ethernet port (RJ45) for network connections, which allows it to supply VoIP to your current landline.

Questions & Answers: ANALOG TELEPHONE ADAPTER

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ANALOG TELEPHONE ADAPTER

Supports 2 SIP profiles through 2 FXS ports and a single 10/100 Mbps port
TLS and SRTP security encryption technology to protect calls and accounts
Automated provisioning options include TR-069 and XML config files
Supports 3-way voice conferencing
Failover SIP server automatically switches to secondary server if main server loses connection
Supports T.38 Fax for creating Fax-over-IP
Supports a wide range of caller ID formats
Use with Grandstream's UCM series of IP PBXs for Zero Configuration provisioning
Allows users to convert analog phones to IP technology for advanced VoIP functionality, security protection, and auto provisioning options
Supports 2 SIP profiles through 2 FXS ports and a single 10/100Mbps port
3-way conferencing
Automated provisioning options
Fax over IP options
Supports a wide range of caller ID formats

$56^.00 –