Now get connected through VOIP very easily.

If you have home-based workers who need to connect to the phone system just as if they were in the office, there are several options. You could have them connect through VoIP software on their computers using a USB headset. You could invest in Cisco VPN-enabled phones.
However, if users want to connect using regular telephones, then you might want to consider Cisco’s Linksys PAP2T.
With Linksys PAP2T (and the earlier version, PAP2) you can connect up to two ordinary analog telephones to VoIP.
You can find a copy of the PAP2T User Guide at the following address:
www.cisco.com/en/US/docs/voice_ip_comm/csbpvga/pap2t
/administration/guide/pap2t_user.pdf