Protect your SIP trunks from fraud and unexpected bills.
Real-time fraud monitoring, automatic blocking, spend limits, and encrypted SIP trunks protect your business from telecoms fraud. UK businesses lose thousands to SIP fraud every year. IP Four makes sure you are not one of them.
3 min
typical time to detect and block a SIP fraud event with real-time monitoring active
100%
of SIP signalling and media encrypted using TLS and SRTP on all trunks we deploy
Zero
financial loss for customers with spend limits correctly configured when fraud occurs
UK-wide
secure SIP trunking with fraud protection for businesses across all UK regions
Layered security for every SIP trunk we manage.
Real-Time Fraud Monitoring
Continuous monitoring of call patterns across your SIP trunks. Unusual activity such as high-volume international calls, calls to premium rate numbers, or off-hours calling detected and flagged immediately.
Automatic Fraud Blocking
Suspicious call patterns blocked automatically without waiting for manual intervention. Calls to known fraud destinations blocked at the platform level before they reach your SIP trunks.
Spend Limits and Alerts
Daily and monthly spend limits configured per trunk and per account. Alerts sent when spending approaches your configured limits. Hard limits prevent any spend above your maximum threshold.
International Call Controls
International calling restricted to the countries your business actually calls. Calls to high-risk destinations blocked by default. Whitelist approach ensures only legitimate international calls are permitted.
SIP Encryption
SIP signalling encrypted using TLS. Media streams encrypted using SRTP. Call content and signalling data protected in transit. Eavesdropping and call interception prevented at the network level.
Access Control and Authentication
SIP trunk access restricted to your registered IP addresses. Strong authentication required for all SIP registrations. Brute force attack protection built into the platform. Unauthorised access attempts blocked and logged.
Security configured, monitored, and maintained.
Fraud Risk Assessment
We assess your current exposure to SIP fraud based on your call patterns, international calling requirements, and existing security controls. Identify the highest-risk areas and prioritise protection accordingly.
Spend Limit Configuration
Daily and monthly spend limits configured based on your normal call volumes. Limits set conservatively to catch fraud early without blocking legitimate calls. Alert thresholds set below the hard limits.
International Call Whitelist
International calling restricted to your approved destination list. Countries your business never calls blocked by default. Whitelist updated as your business requirements change.
Encryption and Authentication Setup
TLS and SRTP encryption enabled on all SIP trunks. IP address restrictions applied. Authentication credentials configured with strong passwords and regular rotation schedule.
Monitoring and Alerting Configuration
Fraud monitoring rules configured for your call patterns. Alert routing set up to notify the right people immediately. Escalation paths documented for out-of-hours incidents.
Ongoing Security Management
Fraud monitoring reviewed quarterly. Spend limits adjusted as your business grows. Security configurations updated when new fraud patterns are identified. Your SIP security maintained proactively.
Fraud protection deployed across the UK.
Challenge: A London professional services firm had their SIP credentials compromised and received a 4,200 pound bill for international calls made over a single weekend before the fraud was detected.
Outcome: Spend limits, international call blocking, and real-time fraud monitoring deployed. IP address restrictions applied. Subsequent fraud attempt detected and blocked within 3 minutes. Zero financial loss.
Challenge: A Manchester hospitality group had multiple SIP trunks across their venues and no centralised visibility of call spend. They had no way to detect if fraud was occurring across their estate.
Outcome: Centralised fraud monitoring deployed across all venues. Spend limits applied per venue and per account. Suspicious activity at one venue detected and blocked within minutes. Group-wide security posture transformed.
Challenge: A Bristol healthcare provider needed to ensure patient call data was protected in transit and that their SIP trunks could not be used to make unauthorised calls outside business hours.
Outcome: TLS and SRTP encryption enabled. Time-of-day calling restrictions applied. Off-hours calls blocked entirely. Patient call data protected in transit. Compliance with data protection requirements confirmed.
Secure your SIP trunks before fraud finds them.
We will assess your current SIP security posture and configure the fraud protection controls your business needs. Spend limits, monitoring, encryption, and access controls all included as standard. Free assessment, no obligation.