DSX 40 starts at 4 lines x 8 digital stations to a capacity of 80 ports . The DSX 160 expands to a capacity of 160 ports. For more details check out the brochure at:

Talkswitch is a hybrid telephone system capable of handling both standard telephone lines and can provide integration to internet service providers for VoIP calls.  The Talkswitch can use any analog telephone , an IP phone, or a combination of the two depending on the system hardware and configuration. Check out theTalkswitch website:

www.talkswitch.com

Vertical Communications

Vertical SBX IP 320.... A very cost-effective converged communication system for the small business. Scalable from 3 lines by 8 stations to 12 lines by 48 stations. The SBX IP 320 system can use the digital key telephone, IP telephones, or analog (single line) telephones. VOIP interface for internet provided trunk calls or branch offices.

For a SBX IP 320 Brochure :

http://www.vertical.com/media/pdf/SBX_Brochure.pdf

Call Twiford Telephone for information on the larger MBX IP system.