Bandwidth.com's Session Initiation Protocol (SIP) Trunking solution, combined with an IP-PBX, enables businesses to save money by consolidating their voice and
data over a single Internet line. Cut costs even further by eliminating the expense of cumbersome, expensive legacy phone systems and analog channels.
Ditch the costly PRI lines! SIP Trunking is an extremely reliable business telecommunications solution that delivers local, toll-free,
domestic and international long distance service. Bandwidth.com's large national footprint offers more than 80% coverage across the U.S., all at rates much lower
than those of traditional analog service. Additionally, with phone numbers from 5000+ rate centers, Bandwidth.com can provide new telephone numbers or port
existing numbers to your new service, ensuring a seamless transition. Learn more about Bandwidth.com's award-winning SIP Trunking service, and fill out the form to
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by Thomas Madison
Network Address Translation must be performed on all packets traversing the firewall on your network. For applications like email or file transfer, the NAT process is relatively seamless. With SIP, however, NAT requires an additional step. NAT only changes the IP address information on the "outside" of the packet; SIP packets are carried inside traditional packets and contain their own address information. Without an extra step, NAT only changes the address on the outside of the packet. This can cause issues like one-way audio when not properly dealt with. Luckily, performing NAT for SIP is usually just a matter of using a SIP-aware firewall, like the Edgewater Edgemarc or the InGate SIParator, that changes the IP address information on the inside as well as the outside of the packet. Your SIP provider should be able to resolve this issue relatively easily.
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