Polycom

http://downloads.polycom.com/voice/voip/sip_sw_releases_matrix.html

http://downloads.polycom.com/voice/voip/sip_sw_releases_matrix.html SIP Firmware for Polycom SoundPoint IP Phones and conf. devices

HOWTO Setup A Remote SIP Extension | FreePBX

http://www.freepbx.org/support/documentation/howtos/howto-setup-a-remote-sip-extension notes on how to setup a “remote extention”, i.e. you have asterisk PBX in the office, but you want to place 1 IP Phone at home. “IP phone at home” is the “remote extention”. Notes explain how to work around NAT gotchas.