Columbia VoIP Testbed
Overview		Architecture	SIP End Clients	Interoperability
The interconnection diagram
The components SIP Server Farm This is the core of the testbed setup, comprising of SIP registrars and proxy servers. The server farm presently comprises of five of the most widely used publicly available SIP servers, running on three different platforms and providing connectivity through three different networks. SIP servers – Asterisk, Pbxnsip, OpenSER, SER, Columbia sipd Platforms – Microsoft Windows XP, Linux (Feroda Core 6), Sun Solaris Connectivity – the Internet, VPN network, PSTN network SIP end-clients The testbed has more than 20 SIP end-clients of varying capabilities (hard and soft phones, wireless phones and video phones) from different vendors, integrated and tested in the setup. More details in the SIP End Clients section. Network devices and support infrastructure These make the testbed setup configurable and help in realizing various logical topologies over the existing physical resources. These include a Cisco 7801 VPN router, wireless access points, NAT devices, Ethernet switches and hubs, DNS and DHCP servers, Columbia wireline and wireless Internet services, among others.
Multi-university testbed setup Image courtesy: http://secnet.csci.unt.edu/