SIP Trunking or [whatever you want to call it]

One person says SIP Trunking, another says interconnecting or some other passé phrase used to describe how one connects to a carrier, authenticates, and manipulates calls. A carrier's ability to offer flexibility in the ways that their customers connect to them is what's really important. In some cases, due to the CPE, the end user or reseller is limited in how their calls can be originated. Standard ATA's typically require a registration and are limited to just sending and receiving calls for a single line. Asterisk and other advanced UAs can send text/prefix authentication with no need to register to send calls. Or, they can choose SIP Trunking and have much more control for both inbound and outbound calls, and multiple lines with multiple DIDs. The fact is that a reseller must support whatever the customer requires; keeping in mind both the business rules and available infrastructure.

Quick Links
SIP Trunking
Text/Prefix Authentication
DID Phone Numbers