Phone

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

Harald Welte's blog -- Paper: Anatomy of contemporary GSM cellphones

http://laforge.gnumonks.org/weblog/2010/04/14/#20100414-anatomy_of_gsm_cellphone An excellent [attempt of ] description of the GSM cell phones hardware, design, architecture and implementation

Skype for Asterisk - Product Overview

http://www.skype.com/intl/en/business/products/pbx-systems/asterisk/ “channel skype” asterisk module, allows you to connect your asterisk box to skype

http://www.simionovich.com/

http://www.simionovich.com/ useful blog about voip tech and asterisk

red5phone - Google Code [open source flash sip client]

http://code.google.com/p/red5phone/ untested. just something to watch for.

ОПЕРАТОР СВЯЗИ Телфин: междугородний и международный телефон, качественная ip-телефония

http://www.telphin.ru/numbers.php DID in SPB, Russia

Response Point Home Page

http://www.microsoft.com/responsepoint/default.mspx Home page for small IP PBX appliance from microsoft – very interesting

SIP + DECT phone ATS X10001P - voip-info.org

http://www.voip-info.org/wiki/view/ATS+X10001P DECT sip phone

D-Link DPH-540/DPH-541 Wi-Fi Phone Security Bypass Vulnerability

http://www.securityfocus.com/bid/24560

VoIP Enabled Cell Phones

http://store.voxilla.com/voip-categories/voip-enabled-cell-phones/ Link to a online store that sells Nokia GSM phones with WiFi and SIP client