FamousTec is a free, vendor-neutral catalog of 214+ tools for unified communications and contact-center engineers. Erlang C calculators, SIP code decoders, PCAP analyzers, codec bandwidth estimators, CUCM CDR reports, and more — all run in your browser with no sign-up.

How do I calculate Erlang C staffing?

Erlang C staffing uses four inputs: call arrival rate, average handle time, target service level, and number of agents. FamousTec's Erlang C calculator iterates until the target service level is met and shows agents required, expected wait time, and occupancy. Try it at https://famoustec.com/tools/erlang-c/.

What codec uses the least bandwidth?

Opus at 8–12 kbps typically delivers the smallest footprint with acceptable voice quality. G.729a is 8 kbps payload but ~32 kbps after IP/UDP/RTP overhead. G.711 is 64 kbps payload and ~100 kbps on-wire. FamousTec's codec bandwidth calculator shows the exact math with SRTP, IPsec, and VPN overhead.

Does FamousTec track users or require sign-up?

No. There are no tracking scripts, no sign-up walls, and no paywalls. Tools run entirely in the browser. Uploaded files (PCAPs, CDRs, logs) are processed client-side and never sent to a server.

Is FamousTec tied to any vendor?

No — FamousTec is vendor-neutral. Tools cover Cisco, Webex, Zoom, Microsoft Teams, Avaya, Ring Central, Genesys, NICE, Five9, Dialpad, 8x8, Mitel, Vonage, and GoTo.

Answer UC questions in 15 seconds.

Erlang sizing, SIP code lookups, codec bandwidth, PCAP analysis, migration estimators, compliance checklists. Every tool runs in your browser. Your data never leaves the tab.

Browse all 311 tools → Or by category

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8 focused areas. Pick one, or search above.

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Calculators

Erlang B/C, bandwidth, ROI, MOS.

47 tools ⧵

Lookups

SIP codes, Q.850, codec tables.

31 tools ≡

Diagnostics

PCAP, SIP ladder, regex, WER.

22 tools ✓

Compliance

E911, PCI, HIPAA, STIR/SHAKEN.

18 tools ◉

Design

Dial plan, routes, IVR flow.

24 tools ⇄

Migration

On-prem → cloud estimators.

16 tools ◆

Platform-specific

Cisco, Teams, Zoom, Genesys, Avaya.

38 tools ✧

AI & Automation

WER, prompt tester, call scoring.

18 tools

Flagship tools

Most-used, most-accurate, most-bookmarked.

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Erlang C Calculator

Size a contact-center queue for your target service level.

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SIP Response Decoder

Every 1xx–6xx code with vendor-specific root causes.

Codec Bandwidth

WAN bandwidth per call with cRTP and VAD factors.

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PCAP VoIP Analyzer

Drop a capture — see call flow, jitter, MOS. Nothing leaves your browser.

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Teams Direct Routing Bandwidth

SBC sizing + PSTN bandwidth for Microsoft Teams Direct Routing.

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Cisco CUCM CDR Analyzer

Upload a CDR export, visualize call volume, disconnect codes, and failures.

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Zoom Phone License Optimizer

Right-size Zoom Phone licenses (Metered vs Unlimited) from call-history CSV.

Contact Center TCO Calculator

3-year TCO across Microsoft, Cisco, and Zoom by seat count and add-ons.

By platform

Vendor-neutral site. Most of you run one of these three.

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CISCO 32 tools

Cisco

UCCE · CUCM · CUBE · Webex Calling · Webex CC

CUCM CDR Analyzer
CUCM License Calculator
UCCX → Webex CC Migrator
Webex Calling vs CUCM Fit Check

Explore 32 Cisco tools →

MICROSOFT 28 tools

Microsoft Teams

Teams Phone · Direct Routing · Operator Connect · Power Platform

Teams SBC Validator
Teams Calling Readiness
Teams DID Import
Teams Auto-Attendant Builder

Explore 28 Microsoft tools →

ZOOM 21 tools

Zoom

Zoom Phone · Contact Center · Meetings · Rooms

Zoom Phone License Optimizer
Zoom Phone DID Import
Zoom Phone Audit
Zoom to Teams Migration

Explore 21 Zoom tools →

Genesys

Cloud CX · Engage · PureConnect

18 tools

Amazon Connect

Contact flows · Lex · Kinesis

14 tools

Avaya

Aura · Elite · OneCloud

12 tools

RingCentral

RingEX · Contact Center

9 tools

8x8 · NICE · Others

All other vendors

22 tools

New this week

Fresh additions. Also published in the newsletter.

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✧

STIR/SHAKEN Attestation Checker

Paste a PASSporT, see A/B/C attestation + cert chain validity.

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Cisco UCCX → Webex CC Estimator

Inventory-level migration cost + timeline by queue count.

◆

Teams Direct Routing SBC Sizing

Concurrent call capacity by SBC vendor and license tier.

Daily UC news brief

One short, vendor-neutral email per weekday. Zero fluff, zero tracking pixels.

See newest tools →

Apr 22. Cisco Webex adds native Co-pilot summary for external participants. Admin rollout is off-by-default; enable at Settings → AI Assistant → External Participants.

Apr 21. Microsoft Teams phones now support BGSM certified endpoints. Works with Teams Phone Mobile plans; carrier list limited to 4 today.

Apr 18. Zoom Phone Power Pack deprecates legacy call queue analytics on May 31. Migration script in our tools → Zoom Phone Audit.

Apr 17. Amazon Connect introduces real-time transcription streaming to third-party WFM. Kinesis schema contact-trace-records-v3.

For the 1%

Need a human in the trenches?

The tools cover the self-serve 99%. The deep, hands-on work — UC Sprint, assessments, fractional CTO — is paid and booked directly. If a calculator isn't enough, talk to us.

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Help us build what's next

Every tool on this site started as a request. Missing something? Need a calculator for your team? We build in public and ship fast.

Request a new feature

Found a tool that's close but not quite right? Want an export format, a new input, a different chart? Tell us. Feature requests ship in our weekly release.

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Need tool development help?

Custom internal calculators, migration estimators, private vendor dashboards, API-driven diagnostics — if your team needs it built, talk to us. Paid engagements, scoped and fixed-fee.

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