SIP & Network
The ITU standard number format that gives every phone number a globally unique representation: a plus sign, country code, and subscriber number.
An E.164 number is at most 15 digits, written as +15551234567. Normalizing every number to E.164 on ingress removes an entire class of bugs where the same number appears in several formats.
Fraud controls, blocklists, and DNO lists are only reliable when every comparison happens against a single canonical format.
Inconsistent number formatting is a silent cause of blocklist misses — the number was on the list, just written differently.
A telephone number assigned to a customer that routes inbound calls directly to a specific endpoint, and is typically used as their outbound caller ID.
The routing number that identifies the switch actually serving a telephone number after number portability, used to route ported calls correctly.
A list of telephone numbers that should never appear as the calling number, such as inbound-only government and bank lines, which carriers may block outright.
SipShield scores live SIP traffic with patented AI so the controls behind this term run automatically — and leave the audit trail regulators expect.