Trends in Enterprise VoIP Steven J. Johnson President Ingate Systems Inc. Phone: 603-883-6569 Email: steve@ingate.com January 23, 2008

What is a SIP Trunk? Use of SIP to set up communications between an enterprise IP-PBX and a service provider A SIP trunk is a logical connection from one point to another Voice is another application over the Internet

Connection to PSTN-gateway Internet Introduction to the following pages. Short, this is the normal situation. Firewall IP-PBX PSTN gateway

What are the benefits of SIP trunking? Eliminates the need to purchase BRIs, PRIs or local PSTN gateways Lower telephony costs Reduces costs All necessary infrastructure to handle additional voice/data traffic is already in place Expands the potential for communications convergence using both voice and data together What are the benefits of SIP trunking?

Who offers SIP trunks today? AGN Networks - USA AT&T – Global Bandwidth.com – USA BandTel – USA Broadvox - USA Cbeyond – USA Gamma – England Global Crossing – Global IP-Only – Sweden Level 3 – Global Nexvortex – USA O1 – USA Paetec – USA Primus – Global RNK VoIP – USA TDC – Sweden Tele2 – Sweden Toplink – Germany Voex – USA Voxitas – USA More coming....

Making SIP Trunking Secure Use a firewall specifically designed to handle SIP communications Protect the PBX from attack Maintain security around the converged network Retain control of the network edge Enable encryption to the service provider (if supported) Intrusion Detection and Prevention Authenticate with the service provider Add redundancy to assure connectivity

The Network Edge Firewall Problem ! - The firewall may stop the signaling Even if traffic is allowed signaling will be corrupt due to lack of: Interoperability Advanced Rewriting Full SIP Proxy and B2BUA function Internet ? Service Provider Local PSTN gateway is replaced by SP A typical customer LAN with a generic firewall Problem: The firewall stops SIP! Dynamic port allocation Complex situations with Hold, xfer, conference etc. Solution: A SIP enabled firewall or technology sip enabling your existing firewall Firewall IP-PBX PSTN gateway

Enterprise Edge Solution Solves interop issues Designed for security QoS Internet Service Provider Local PSTN gateway is replaced by SP A typical customer LAN with a generic firewall Problem: The firewall stops SIP! Dynamic port allocation Complex situations with Hold, xfer, conference etc. Solution: A SIP enabled firewall or technology sip enabling your existing firewall Firewall SIParator® IP-PBX Enterprise SBC

What else can I do with SIP besides SIP Trunking? Connecting Remote Workers Video on the desktop Specialized video applications Collaboration Support Services What else can I do with SIP besides SIP Trunking?

Summary SIP is the protocol of choice for IP communications SIP trunking is the catalyst for enterprise adoption of VoIP Must add security to assure that the network is not compromised Other applications will leverage the infrastructure to provide further functionality Unified communications Video Etc.

Thank You Steven J. Johnson President Ingate Systems Inc. Phone: 603-883-6569 Email: steve@ingate.com www.ingate.com