Full E2E Interconnect Certification Plan¶
SIG-GW / IBCF — Carrier Interconnect Readiness
Author: Daniel
Scope: End-to-end NNI/Ic validation before peering activation
1. Certification Phases¶
Phase 1: Lab Functional Validation¶
Duration: 1-2 weeks
Environment: Isolated lab environment
Objective: Validate all functional requirements
Phase 2: Controlled Interconnect Testing¶
Duration: 1 week
Environment: Controlled interconnect with partner
Objective: Validate interconnect scenarios
Phase 3: Load & Soak Testing¶
Duration: 1 week
Environment: Production-like load
Objective: Validate performance and stability
Phase 4: Regulatory Scenario Validation¶
Duration: 1 week
Environment: Production-like with regulatory scenarios
Objective: Validate regulatory compliance
Phase 5: Operational Readiness¶
Duration: 1 week
Environment: Production
Objective: Validate operational procedures
2. Functional Validation¶
2.1 Basic SIP Call Flows¶
Test Cases: - INVITE → 100 Trying → 180 Ringing → 200 OK → ACK - BYE → 200 OK - CANCEL → 487 Request Terminated → 200 OK - Re-INVITE (mid-call update) - UPDATE (early media)
Acceptance Criteria: - All call flows complete successfully - Response codes correct - Headers properly formatted - Timers respected
2.2 Topology Hiding Verification¶
Test Cases: - Internal Via headers removed - Internal Record-Route headers removed - Contact headers rewritten - SDP connection addresses hidden
Acceptance Criteria: - No internal IPs exposed - No internal hostnames exposed - Topology completely hidden
2.3 Codec Negotiation Compliance¶
Test Cases: - AMR-WB negotiation - G.711 negotiation - H.264 negotiation (video) - Codec mismatch handling - Transcoding (if enabled)
Acceptance Criteria: - Codecs negotiated correctly - Fallback works - SDP properly formatted
2.4 STIR/SHAKEN Signing & Verification¶
Test Cases: - A-level attestation signing - B-level attestation signing - C-level attestation signing - Signature verification - Certificate chain validation - OCSP validation
Acceptance Criteria: - All calls signed correctly - Signatures verify correctly - Attestation levels correct - Certificates valid
2.5 Emergency Routing Validation¶
Test Cases: - 911 routing (US) - 112 routing (EU) - 999 routing (UK) - 000 routing (AU) - Location header preservation - Priority handling
Acceptance Criteria: - All emergency numbers routed correctly - Location preserved - Highest priority - No blocking
2.6 Lawful Intercept Continuity¶
Test Cases: - Signaling interception - Media interception - Intercept during re-INVITE - Intercept during transfer - Intercept during failover
Acceptance Criteria: - All intercepts complete - No loss during events - Audit logs complete
3. Interconnect Scenarios¶
| Scenario | Test ID | Expected Result | Validation |
|---|---|---|---|
| Inbound Call | INT-001 | Proper routing + verification | Call completes, STIR verified |
| Outbound Call | INT-002 | Correct signing | Identity header present, signed |
| Transit Call | INT-003 | Header preservation | Identity header preserved |
| Emergency Call | LIE-101 | Priority route | Routed to PSAP, no blocking |
| Intercepted Call | LIE-001 | Media duplication | Signaling + media to MD |
| Cross-Border Call | INT-004 | C-level attestation | Correct attestation level |
| Roaming Emergency | LIE-110 | Correct routing | Routed to home PSAP |
| Multi-Hop Call | INT-005 | Header integrity | Identity header preserved |
4. Negative & Abuse Testing¶
4.1 SIP Fuzzing¶
Test Cases: - Malformed INVITE - Oversized headers - Invalid SIP version - Missing required headers - Invalid URI formats
Acceptance Criteria: - No crashes - Proper error responses (400/488) - Logging of attacks - Rate limiting active
4.2 TLS Mismatch¶
Test Cases: - Invalid certificate - Expired certificate - Wrong CA - Weak cipher suite - TLS version mismatch
Acceptance Criteria: - Connection rejected - Proper error logging - No fallback to insecure
4.3 Invalid Certificates¶
Test Cases: - Revoked certificate - Expired certificate - Self-signed certificate - Wrong domain certificate
Acceptance Criteria: - STIR verification fails - Calls rejected (hard-fail) or marked unverified (soft-fail) - Proper logging
4.4 Attestation Spoof Attempts¶
Test Cases: - Attempt to upgrade A→B - Attempt to upgrade B→A - Invalid attestation claim - Missing attestation
Acceptance Criteria: - Attestation downgrade only - Invalid claims rejected - Proper logging
4.5 Flood Attacks¶
Test Cases: - INVITE flood (20k CPS) - ACK flood - BYE flood - Mixed method flood
Acceptance Criteria: - Rate limiting active - Legitimate calls pass - Attack traffic blocked - No crash or degradation
4.6 Malformed SDP¶
Test Cases: - Invalid SDP format - Missing required fields - Invalid codec names - Oversized SDP
Acceptance Criteria: - Proper error responses (488) - No crashes - Logging of errors
5. Load & Soak Testing¶
5.1 Burst Load Test¶
Test Configuration: - Load: 2× rated CPS for 60 minutes - Duration: 60 minutes - Metrics: CPS, PDD, CPU, Memory
Acceptance Criteria: - No packet loss - PDD within target - CPU < 85% - No crashes
5.2 Sustained Load Test¶
Test Configuration: - Load: 100% rated CPS - Duration: 24 hours - Metrics: All KPIs
Acceptance Criteria: - All KPIs within target - No memory leaks - No degradation - Stable performance
5.3 Packet Loss Simulation¶
Test Configuration: - Load: 100% rated CPS - Packet Loss: 10% - Duration: 1 hour - Metrics: Retransmission rate, call success
Acceptance Criteria: - Retransmissions handled - Calls complete successfully - No crashes - Graceful degradation
5.4 Certificate Rotation During Load¶
Test Configuration: - Load: 100% rated CPS - Event: Certificate rotation - Duration: Rotation window - Metrics: Call success, latency
Acceptance Criteria: - Zero downtime - No call drops - Latency within target - Seamless transition
6. Failover Testing¶
6.1 Kill Active Node¶
Test Configuration: - Setup: Active/Active (2 nodes) - Event: Kill primary instance - Load: 100% rated CPS - Metrics: Failover time, call loss
Expected Result: - Failover ≤ 1 second - Zero call loss - No emergency drop - No LI drop - No system crash
6.2 Restart Signaling Pod¶
Test Configuration: - Setup: Kubernetes pod restart - Event: Restart signaling pod - Load: 100% rated CPS - Metrics: Restart time, call handling
Expected Result: - Restart ≤ 10 seconds - In-flight calls handled - New calls accepted - No degradation
6.3 DNS Failover Test¶
Test Configuration: - Setup: DNS-based failover - Event: Primary DNS failure - Load: 100% rated CPS - Metrics: Failover time, DNS resolution
Expected Result: - Failover ≤ 2 seconds - DNS resolution continues - No call loss - Seamless transition
6.4 State Store Outage¶
Test Configuration: - Setup: State store dependency - Event: State store unavailable - Load: 100% rated CPS - Metrics: Degradation, recovery
Expected Result: - Graceful degradation - Stateless paths continue - Fast recovery (≤ 5 seconds) - No crash
7. Documentation Required¶
7.1 SIP Traces¶
Required: - Sample INVITE flow - Sample emergency call flow - Sample intercepted call flow - Sample STIR signing/verification flow - Sample failover flow
Format: PCAP or SIP message logs
7.2 KPI Dashboard Snapshots¶
Required: - 24-hour KPI dashboard - Peak load snapshot - Failover event snapshot - Emergency call metrics - LI intercept metrics
Format: Grafana dashboard exports
7.3 Certificate Validation Logs¶
Required: - Certificate fetch logs - OCSP validation logs - Certificate rotation logs - STIR signing logs
Format: Structured logs (JSON)
7.4 Audit Log Extracts¶
Required: - LI warrant activation logs - LI intercept logs - Emergency call logs - Security event logs
Format: Tamper-evident logs
7.5 Chaos Injection Reports¶
Required: - Pod kill test results - Network partition results - CPU throttling results - DNS failure results
Format: Test execution reports
8. Certification Exit Criteria¶
8.1 Test Execution¶
- ✅ All test cases pass
- ✅ All test catalogs executed (IBCF, STIR/SHAKEN, LI/Emergency)
- ✅ All PIXIT configurations validated
- ✅ All negative tests pass
8.2 KPI Targets¶
- ✅ All KPIs within target
- ✅ 72-hour sustained load test passed
- ✅ No severity-1 incidents
- ✅ SLO compliance validated
8.3 Regulatory Audit¶
- ✅ LI compliance validated
- ✅ Emergency compliance validated
- ✅ STIR/SHAKEN compliance validated
- ✅ Security compliance validated
- ✅ Documentation complete
8.4 Peering Partner Approval¶
- ✅ Interconnect scenarios validated
- ✅ Partner test cases pass
- ✅ Peering agreement signed
- ✅ Production activation approved
9. Certification Timeline¶
| Phase | Duration | Dependencies | Deliverables |
|---|---|---|---|
| Phase 1: Lab Functional | 1-2 weeks | Test environment ready | Functional test report |
| Phase 2: Controlled Interconnect | 1 week | Partner coordination | Interconnect test report |
| Phase 3: Load & Soak | 1 week | Load test environment | Performance test report |
| Phase 4: Regulatory | 1 week | Regulatory scenarios | Compliance report |
| Phase 5: Operational Readiness | 1 week | Production environment | Operational readiness report |
Total Duration: 5-7 weeks
10. Risk Mitigation¶
10.1 Test Failures¶
- Mitigation: Immediate investigation and fix
- Escalation: Block certification until resolved
- Documentation: Failure analysis and resolution
10.2 Partner Delays¶
- Mitigation: Early coordination and scheduling
- Contingency: Extended timeline
- Communication: Regular status updates
10.3 Regulatory Changes¶
- Mitigation: Stay current with regulations
- Updates: Adapt test scenarios
- Documentation: Update compliance checklist