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 callsacross branches, home offices, vehicles, and edge sites.
- Global dial without guessworknumbers, porting, regulatory, and emergency services handled.
- Security & trustSTIR/SHAKEN, TLS/SRTP, ZTNA admin access, PCI/HIPAA controls.
- Observability & proofMOS/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
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 classesEF for RTP, AF for signaling, BE for bulk.
- Wi-Fi tuningminimum data rates, roaming thresholds, airtime fairness; site surveys for capacity/density.
- SD-WANpacket duplication for voice, FEC for video, brownout steering, Anycast ingress selection.
- Codec strategyOpus / G.722 wideband preferred, fallback to G.711; transcode only at SBCs.
- Jumbo MTUfor L2 trunks or DCI if voice shares links with storage.
🔐 Security & Trust (baked in)
- TransportTLS for signaling, SRTP for media; modern ciphers only.
- Caller identitySTIR/SHAKEN to fight spoofing; inbound analytics for fraud/robocalls.
- AccessZTNA for admin consoles, NAC 802.1X for ports, MDM/UEM + EDR for endpoints; SASE for roaming users.
- EdgesWAF/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.
Key terms in plain language
Open a term for a concise explanation of language used on this page.
Bandwidth
The amount of data a connection can carry in a given time, usually measured in Mbps or Gbps. More bandwidth supports more users, devices, and simultaneous applications.
Latency
The time it takes data to travel between two points. Lower latency improves voice, video meetings, cloud applications, gaming, and other real-time services.
Dedicated Internet Access (DIA)
A business-grade Internet connection with capacity dedicated to the customer rather than shared in the same way as typical consumer broadband. It often includes symmetrical speeds and an SLA.
SD-WAN
Software-defined wide area networking. It manages multiple connections and chooses paths based on application needs, performance, and policy to improve resilience and control.
MPLS
Multiprotocol Label Switching, a private-network technology that directs traffic along managed paths. Organizations use it for predictable connectivity between locations.
Unified Communications (UCaaS)
A cloud-based combination of business calling, messaging, meetings, presence, and collaboration tools managed as one communications service.
SIP Trunking
A service that connects a business phone system to the public telephone network using Internet Protocol, replacing or supplementing traditional phone lines.
SASE
Secure Access Service Edge combines networking and security capabilities in a cloud-delivered architecture so users and locations can receive consistent policy wherever they connect.