2026-03-01
A SIP trunk is a virtual phone line that connects your PBX or communications system to the telephone network over the internet. It replaces traditional phone lines (PRI/T1) with a VoIP connection that can carry multiple concurrent calls.
In the context of caller ID spoofing, a SIP trunk is your connection to SpoofGlobal's servers. Your SIP credentials authenticate you, and the trunk carries your calls to the provider network.
A softphone is software that acts as a phone on your computer or mobile device. It connects to a SIP server (like SpoofGlobal) using your credentials and lets you make and receive calls. Zoiper, Linphone, and Groundwire are all softphones.
Think of it this way: the SIP trunk is the road, and the softphone is the car. You need both. SpoofGlobal provides the trunk (SIP credentials + server), and you provide the softphone (Zoiper, etc.) to actually place calls.
SpoofGlobal offers two authentication methods:
No. For individual use, just install a softphone like Zoiper and register with your SpoofGlobal SIP credentials. A PBX is only needed for advanced setups like call centers.
Yes. Configure SpoofGlobal as an outbound SIP trunk in your Asterisk system. Use IP2IP authentication for seamless integration without registration.
SIP registration supports one concurrent call per account. IP2IP supports multiple concurrent calls. For higher concurrency, create multiple SIP accounts or use IP2IP mode.