Asterisk Caller ID Spoofing

WHY ASTERISK FOR CALLER ID SPOOFING?

Asterisk is the most widely used open-source PBX in the world. Combined with SpoofGlobal's SIP trunking, it gives you complete control over outbound caller ID for every call. You can set different caller IDs per extension, per route, or dynamically per call using the Asterisk dialplan.

CONNECTION OPTIONS

There are two ways to connect your Asterisk server to SpoofGlobal:

• SIP Registration — your Asterisk registers with a username and password. Works from any IP.
• IP2IP — no registration needed. Whitelist your server's static IP in the bot and send calls directly. See the IP2IP guide for details.

TRUNK CONFIGURATION (CHAN_SIP)

If your Asterisk uses chan_sip, add a trunk in sip.conf:

• Set type=peer
• Set host to SpoofGlobal's server IP
• For SIP auth: set username and secret from the bot
• For IP2IP: no username/secret needed, just the host
• Set insecure=invite for IP2IP trunks
• Set fromdomain to the server IP

TRUNK CONFIGURATION (PJSIP)

For PJSIP, create an endpoint, AOR, and optionally an auth section. For IP2IP mode, you only need the endpoint and AOR — no auth section required.

SETTING CALLER ID IN THE DIALPLAN

The simplest way to set caller ID per-call is in extensions.conf:

• Use Set(CALLERID(num)=18005551234) before the Dial command
• Use Set(CALLERID(name)=My Company) for the display name
• The number set here overrides the default from the bot

For dynamic spoofing, you can read the desired caller ID from a database, a variable, or user input via an AGI script.

OUTBOUND ROUTE

Create a dialplan context that routes calls through the SpoofGlobal trunk. Match the destination pattern, set your desired caller ID, and dial through the trunk.

TESTING

Use the Asterisk CLI (asterisk -rvvv) to watch SIP messages and verify your caller ID is being sent correctly. Check that the From header contains the number you set.