1. Trends in Enterprise VoIP
Steven J. Johnson
President
Ingate Systems Inc.
Phone:
January 23, 2008

2. 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

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

4. 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?

5. 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....

6. 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

7. 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

8. 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

9. 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?

10. 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.

11. Thank You Steven J. Johnson President Ingate Systems Inc.
Phone: