Free online classified ads and job posting at Astanda.com
http://www.cisco.com/
Manufacturer of complete MAN, WAN, LAN, and WLAN equipment. The site includes an extensive library of product and technology documentation, as well as in-depth network solutions.
http://www.nokia.com/
Cellphones, accessories, and mobile data.
http://www.agilent.com/
Offers a range of design and test instruments. Products include RF and microwave and wireless test equipment. Offers a facility to purchase online .
http://asterisk.org
An open source telephony switching and private branch exchange service. Allows peer-peer calling using a variety of voice over internet protocols.
http://www.att.com/
Provides long-distance, international and wireless services as well as internet access.
http://www.bellsouth.com/
Local Exchange Carrier (LEC) with local to global offerings in voice, data and Internet.
http://www.bt.com/
National telecommunications provider. Details on products and services, plus user area.
http://www.dialpad.com
Offers monthly billing and pre-paid PC-to-Phone VoIP services. Also supports broadband telephone adapter for use without PC.
http://www.ericsson.com/
Designs, manufactures and distributes telecommunication systems and equipment, such as public telephone and telex switching systems.
http://www.francetelecom.com/
French voice, data, and Internet company. In English and French.
http://www.level3.com/
Large network throughout the US and Europe. Voice / Data / Internet.
http://www.lightreading.com/
Optical communications online journal with significant optical MEMS technology focus.
http://www.motorola.com/
Providers of analog and digital two-way voice and data radio products and systems for conventional, shared and private applications worldwide.
http://www.ntia.doc.gov/
US Presidents principal adviser on telecommunications and information policy.
http://www.nortel.com/
Telephony and IP-based data, wireline and wireless networking.