PSTN, SIP, PBX, UC/UCaaS, E911/NG911 — Engineered, Secured, and Proven
Voice still runs the business—sales, service, safety, and command.
SolveForce delivers Telephony & Voice as a system: numbers & routing, SIP trunks and SBCs, on-prem PBX or UC/UCaaS, emergency services (E911/NG911), STIR/SHAKEN, recording & redaction, QoS-engineered networks, and evidence pipelines so every call, change, and test is measurable and auditable.
Related pages
• Cloud PBX & UC → /hosted-voice • Contact Center → /ccaas • Trunks & SBC → /sip-trunking
• Networks & QoS → /lan • /sd-wan • Optical/DCI → /wavelength
• Security → /ztna • /sase • /nac • Edge → /waf • Compliance → /pci-dss • /hipaa
• Evidence & Ops → /siem-soar • /noc
🎯 Business Outcomes
- Clear, reliable calls across branches, home offices, vehicles, and edge sites.
- Global dial without guesswork: numbers, porting, regulatory, and emergency services handled.
- Security & trust: STIR/SHAKEN, TLS/SRTP, ZTNA admin access, PCI/HIPAA controls.
- Observability & proof: MOS/jitter/latency dashboards, CDRs, SBC traces, E911 test logs—exportable to auditors.
🧭 Reference Architecture (how pieces snap together)
1) Identity & Directory — SSO/MFA, SCIM licensing, RBAC for admins, phone number ownership tied to users/queues. → /iam • /identity-lifecycle
2) Network & QoS rails — LAN with 802.1X, Wi-Fi 6/6E/7 tuning, SD-WAN packet duplication/FEC, DIA + LTE/5G/satellite underlays, Anycast meeting ingress. → /lan • /sd-wan
3) SBC & PSTN edge — SBCs anchor media, hide topology, normalize SIP, implement STIR/SHAKEN, route E911/NG911, and enforce policies. → /sip-trunking
4) Call control plane
- On-prem PBX (retain/modernize) or Cloud PBX / UCaaS.
- Interop with Microsoft Teams / Zoom (Direct Routing/Operator Connect).
5) Security layer — TLS/SRTP, ZTNA for admin consoles, NAC for ports, SASE for roaming, WAF/Bot for portals & APIs, PCI/HIPAA recording policies. → /ztna • /nac • /waf
6) Observability & evidence — Quality analytics, SBC traces, license usage, config diffs, E911 tests → /siem-soar; escalations via /noc.
🧰 Service Catalog (end-to-end)
Numbers & Routing
- DIDs / Toll-Free, vanity numbers, CNAM, LNP (porting) with FOC scheduling and parallel ring.
- Global dial enablement by country/region, compliant CLI policies, time-zone attendants & holidays.
Trunking & Session Border Controllers
- SIP Trunking (single/dual), SBC design (cloud, on-prem, or hybrid), media anchoring, transcoding policy, encryption (TLS/SRTP), STIR/SHAKEN attestation/verification.
PBX & UC/UCaaS
- Cloud PBX features (auto attendants, hunt groups, queues), voicemail-to-text, meeting/video, messaging/presence.
- Teams/Zoom Direct Routing, room systems, analog integration (ATA/FXS), interop with paging, door phones, and overhead speakers. → /hosted-voice
Contact Center Integration
- CCaaS skills/queues/IVR/IVA, CRM screen-pop, after-call summaries, analytics; compliant recording & redaction. → /ccaas
Compliance Recording & Redaction
- Pause/Resume, DTMF masking, PCI tokenization, HIPAA encryption/retention, role-based playback with audit logs. → /pci-dss • /hipaa
Emergency Services
- E911/NG911 with dispatchable location (fixed & nomadic), test-call runbooks & artifacts per site; international emergency equivalents where supported.
POTS Replacement / PRI Sunset
- Analog line migration for alarms, elevators, fax (T.38/eFax), fire panels—documented compatibility & battery/UPS runbooks.
🔧 Engineering Voice Quality (what actually matters)
- QoS classes: EF for RTP, AF for signaling, BE for bulk.
- Wi-Fi tuning: minimum data rates, roaming thresholds, airtime fairness; site surveys for capacity/density.
- SD-WAN: packet duplication for voice, FEC for video, brownout steering, Anycast ingress selection.
- Codec strategy: Opus / G.722 wideband preferred, fallback to G.711; transcode only at SBCs.
- Jumbo MTU for L2 trunks or DCI if voice shares links with storage.
🔐 Security & Trust (baked in)
- Transport: TLS for signaling, SRTP for media; modern ciphers only.
- Caller identity: STIR/SHAKEN to fight spoofing; inbound analytics for fraud/robocalls.
- Access: ZTNA for admin consoles, NAC 802.1X for ports, MDM/UEM + EDR for endpoints; SASE for roaming users.
- Edges: WAF/Bot for portals/APIs; email auth (SPF/DKIM/DMARC/BIMI) to stop BEC on voice change requests. → /email-auth
📈 Quality & Codec Quick Table
| Codec | Bitrate (kb/s) | Bandwidth per Call* | Notes |
|---|---|---|---|
| Opus (wideband) | 16–24 | ~30–50 kb/s | High quality, resilient; preferred on softphones |
| G.722 (wideband) | 64 | ~100 kb/s | Wideband deskphone codec |
| G.711 µ/Α (narrowband) | 64 | ~100 kb/s | Legacy compatibility; higher BW; easiest interop |
| G.729 (narrowband) | 8 | ~30–40 kb/s | Low BW, lower fidelity; avoid if you can |
* Approximate including IP/UDP/RTP overhead; VLAN/MPLS/SD-WAN encapsulation adds headroom. Always budget for signaling and spikes.
📐 SLO Guardrails (telephony you can measure)
| Domain | KPI / SLO (p95 unless noted) | Target |
|---|---|---|
| Call setup | Post-Dial Delay (local / long-haul) | ≤ 1–2 s / ≤ 2–4 s |
| Voice quality | MOS (wideband) | ≥ 4.1 |
| Jitter | One-way | ≤ 20–30 ms |
| Packet loss | Sustained | < 0.2–0.5% |
| SD-WAN | Brownout steer | ≤ 1–3 s |
| Survivability | Branch PSTN failover | ≤ 30–120 s (design-dependent) |
| STIR/SHAKEN | Outbound attestation pass-rate | ≥ 98–99% |
| E911/NG911 | Quarterly test completion | = 100% of in-scope sites |
| Security | ZTNA attach (admin) | ≤ 1–3 s |
| Evidence | CDRs/config diffs → SIEM | ≤ 60–120 s |
SLO breaches auto-open a case and trigger SOAR runbooks (reroute, enable packet duplication, switch SBC, codec shift, roll back policy), with artifacts attached. → /siem-soar
🔁 Use-Case Patterns
- UC Core (Cloud PBX + Meetings + Messaging) — softphones/mobile/desk phones, auto attendants, voicemail-to-text; E911 onboarding; SBC interop. → /hosted-voice
- Teams/Zoom Direct Routing — SBCs + policies; survivability; STIR/SHAKEN; room systems; identity federation.
- Contact Center Modernization — CCaaS skills/queues/IVA; PCI redaction; CRM/ITSM screen-pop; post-call AI summaries. → /ccaas
- Branch Resilience Pack — DIA + 5G/LTE with SD-WAN, packet duplication, SBC local routing, UPS runbooks, E911 tests. → /sd-wan
- Regulated Communications (PCI / HIPAA) — pause/resume, DTMF masking, redaction/tokenization, encrypted storage, consent prompts, legal holds. → /pci-dss • /hipaa
- POTS/PRI Replacement — ATAs for fax/alarms/elevators (T.38/eFax), MOPs & acceptance tests, battery/UPS plans.
✅ Acceptance Tests & Artifacts (we keep the receipts)
- Quality — synthetic MOS/jitter/loss tests, meeting join time, call setup timing.
- Network — DSCP preservation, SD-WAN packet-dup/FEC effectiveness, path failover timing, Anycast ingress selection.
- Security — TLS/SRTP cipher check, STIR/SHAKEN headers, ZTNA admin admits, WAF/Bot events.
- Emergency — E911/NG911 test-call recordings & screenshots, dispatch confirmation logs.
- Compliance — PCI redaction proof (pause/resume, DTMF masking), HIPAA recording access controls, retention/hold exports.
- Change — SBC/tenant diffs (before/after), LNP FOC records, number inventory changes.
All artifacts stream to /siem-soar and are bundled for QBRs/audits.
🧾 Ordering & Design Checklist (copy/paste & fill)
Locations & Timing
- Site addresses + MPOE/IDF info, target cutover windows, E911 dispatch locations
Numbers
- DIDs/toll-free inventory, portability status, vanity/CNAM requirements
Routing & Features
- Auto attendants, hunt groups, queues, business hours & holidays, failover destinations
Trunks & SBC
- Channels/throughput, dual-homed SBCs (Y/N), media anchoring sites, encryption (TLS/SRTP)
Interop
- Teams/Zoom Direct Routing (Y/N), analog devices (fax/alarms/elevators/paging), CCaaS platform
Network & QoS
- DIA speeds, 5G/LTE backups, SD-WAN vendor/policies, Wi-Fi density/voice SSIDs, QoS class mapping
Security & Compliance
- IdP/SSO/MFA, ZTNA admin scope, NAC posture, WAF posture, PCI/HIPAA overlays
Recording & Retention
- Pause/resume, DTMF masking, redaction/tokenization, retention/hold policies
Evidence & Ops
- SIEM destination, reporting cadence, escalation matrix (carrier + internal), quarterly E911 test plan
We’ll return a design-to-quote with architecture, carrier options, SLO-mapped pricing, compliance overlays, and an evidence plan you can reuse in QBRs and audits.
Or jump to /customized-quotes.
📞 Make Every Call Count—Clear, Secure, and Auditable
- Call: (888) 765-8301
- Email: contact@solveforce.com
From SIP trunks and SBCs to UC/UCaaS and CCaaS, from E911/NG911 to PCI/HIPAA—we’ll build voice that’s clear, resilient, and provable.