Linksys ATA Administration Guide
62
SIP Trunking and Hunt Groups on the SPA8000
About SIP Trunking
The SIP Trunking feature allows a traditional PBX to seamlessly migrate from PSTN service to
VoIP service over a broadband link. The SPA8000 offers up to eight telephone lines to the PBX.
The SPA8000 offers four trunk groups, numbered T1, T2, T3, and T4. A SIP-based voice service
with an ITSP can be configured on each trunk group with a distinct phone number. Each of the
eight SPA8000 lines can be configured either as a standalone line, as in a classic ATA FXS port, or
as a trunk line that is associated with a trunk group.
•
Inbound calling: A trunk group offers a single number for callers to call into the small
business, with the capability to programmatically ring one or more trunk lines.
•
Outbound calling: When a PBX phone makes a call, the PBX selects one of the available
trunk lines. The trunk line assumes the Caller ID of the trunk group.
Internet
Integrated
Access Device
SPA8000
ITSP
Fax
PBX System
Fax
PBX System
