Carrier intelligence
Know where a number routes before you rate, route, or risk-score it.
Carrier Lookup returns routing intelligence such as LRN, mobile portability, and carrier-of-record context so telecom teams can make better call-routing, fraud, and cost decisions.
Three workflows, one API
- For real-time call setup — LRN lookup at signup time, fraud-check time, or call-setup time. REST and webhook formats.
- For ops teams — Portal lookup with shareable URLs and exportable history. No API key required for users with portal access.
Lookup modes
-
Real-time API
Query numbers during call setup, signup, fraud checks, or support workflows.
-
Portal queries
Give operations teams a simple manual lookup path for support and troubleshooting.
-
Routing context
Use carrier-of-record and portability signals as inputs, not as the only routing control.
API examples
LRN returns the location-routing number for a destination call. Toll-free RespOrg returns the responsible organization for a toll-free number. Portability check returns whether numbers can be ported in.
curl -X POST https://api.voicetel.com/v2.1/info/lrn/ \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"apikey": "YOUR_API_KEY",
"cid": 2015551234,
"dst": 2125551234
}'curl -X POST https://api.voicetel.com/v2.1/info/tfresporg/ \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"apikey": "YOUR_API_KEY",
"tn": 8005551234
}'curl -X POST https://api.voicetel.com/v2/iNumbering/portInAvailability/ \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"apikey": "YOUR_API_KEY",
"tnList": {
"tnItem": [
{ "tn": 2015551234 },
{ "tn": 2015555678 }
]
}
}'Full reference: VoiceTel API v2.2 › LRN lookup · Info API v2.1 › Toll-free RespOrg · VoiceTel API v2.2 › Port-in availability.