Free UCaaS & Network Engineering Tools — SystemStackHQ
· Free Browser Tools ·

Engineering tools that actually work in the field

Every tool on this page runs entirely in your browser — no login, no account, no data sent anywhere. Built for engineers who need answers mid-deployment, not after a signup flow.

No login required
Always free
Teams + Webex + Networking
Runs in browser
Available tools 5 tools
Live
Teams Calling License Wizard
Answer 5 questions about headcount, call volume, existing infrastructure, and tenant setup. Get a recommended starting license stack with a “things to verify” checklist before you finalize.
How to use

Enter your user and space counts, select your expected call volume and infrastructure situation, then choose your Azure tenant scenario. The tool outputs a recommended profile and starting license stack instantly.

Teams Calling
Live
VoIP Bandwidth Calculator
Calculate required bandwidth for your voice deployment based on codec selection, concurrent call volume, and overhead. Output includes per-site and aggregate requirements.
How to use

Select your codec (G.711, G.722, Opus, etc.), enter the number of concurrent calls per site, and get your bandwidth requirement with overhead factored in — per site and total.

Teams Calling Webex Calling Networking
Live
Subnet & IP Planning Calculator
Clean, fast subnet math. Enter an IP address and prefix length, get network address, broadcast, usable host range, and total host count. Faster and cleaner than anything currently out there.
How to use

Enter an IP address and CIDR prefix (e.g. 192.168.1.0/24). Get network address, broadcast address, usable host range, and total usable hosts back immediately.

Teams Calling Webex Calling Networking
Live
SIP Header Breakdown Tool
Paste a raw SIP message and get each header field labeled, explained, and highlighted. Cuts down trace analysis time mid-troubleshooting when you need to know what a header actually means.
How to use

Paste a raw SIP message from your trace capture or SBC log. The tool parses each line, labels every header field, and provides a plain-English explanation of what each value means in context.

Teams Calling Webex Calling Networking
Live
AWS VPC & TCO Calculator
Plan your AWS VPC architecture and calculate total cost of ownership for cloud network deployments. Model your topology, estimate running costs, and compare against on-premises infrastructure spend.
How to use

Enter your VPC configuration — regions, subnets, NAT gateways, and traffic volumes. Get a cost breakdown by component and a TCO comparison to help justify or size your AWS network investment.

Networking
Coming soon 8 tools
Coming soon
QoS & DSCP Planning Tool
Select your platform and traffic types, get the recommended DSCP markings, queue configurations, and bandwidth allocations for a production-ready QoS policy.
How to use

Select your platform (Teams or Webex), choose which traffic types are in scope (voice, video, signaling, sharing), and get the recommended DSCP values and policy configuration output per Microsoft and Cisco specifications.

Teams Calling Webex Calling Networking
Notify me when live →
Coming soon
Call Capacity Planner
Plan call capacity across multiple sites. Enter user counts, expected concurrency ratios, and codec selection — get per-site and aggregate capacity requirements for SBC sizing, trunk planning, and gateway provisioning.
How to use

Enter the number of sites, users per site, and your expected peak concurrency ratio. Select your codec and get concurrent call capacity requirements per site and in total — sized for SBC or gateway provisioning.

Teams Calling Webex Calling Networking
Notify me when live →
Coming soon
Dial Plan / Normalization Rule Tester + Generator
Paste your normalization rule regex, enter a test number, and see exactly what it normalizes to before it goes anywhere near a production tenant. Catches silent failures before go-live.
How to use

Paste your normalization rule pattern and translation string, then enter a test dial string. The tool runs the regex match and shows you the normalized output — or flags why the rule didn’t match.

Teams Calling Webex Calling
Notify me when live →
Coming soon
Firewall Port Reference Tool
Filter the complete port and protocol requirements for Teams and Webex by platform, direction, and protocol type. Copy the filtered output directly into your firewall change request — no more hunting through vendor docs.
How to use

Select your platform (Teams, Webex, or both), filter by traffic direction (inbound, outbound) and protocol (TCP, UDP, HTTPS). Get a clean, filtered table of required ports you can copy directly into a firewall rule request.

Teams Calling Webex Calling Networking
Notify me when live →
Coming soon
Network Readiness Checklist
Interactive pre-deployment checklist for UCaaS network readiness. Work through each item, get a pass/fail readiness score, and know exactly what needs to be resolved before you go live.
How to use

Select your platform and work through the checklist items — latency, jitter, packet loss, QoS config, firewall rules, split tunneling, and more. Each item is pass/fail. Get a readiness score and a list of open items at the end.

Teams Calling Webex Calling Networking
Notify me when live →
Coming soon
SIP Trunk Sizing Estimator
Estimate the number of SIP trunks required for your deployment based on user count, concurrency ratios, and call patterns. Avoid under-provisioning at go-live or over-spending on trunk capacity you don’t need.
How to use

Enter your total user count, peak concurrency ratio, and expected inbound vs. outbound call split. Get a recommended trunk count with headroom factored in — sized for your SBC or carrier configuration.

Teams Calling Webex Calling Networking
Notify me when live →
Coming soon
Direct Routing vs Operator Connect
Answer questions about your infrastructure, carrier relationships, SBC ownership, and admin overhead tolerance — get a clear recommendation on which PSTN connectivity model fits your deployment, and why.
How to use

Work through a short decision tree covering your existing SBC situation, carrier contracts, internal admin capacity, and customization requirements. Get a direct recommendation with a breakdown of the tradeoffs for your specific scenario.

Teams Calling
Notify me when live →
Coming soon
Failover / Survivability Estimator
Map out your survivability posture across sites. Enter your topology, WAN redundancy, and SBC configuration — identify which sites lose calling capability if your primary connection drops and what it takes to fix it.
How to use

Enter your site count, WAN redundancy setup, SBC placement, and survivable branch appliance status. The tool flags sites with no survivability coverage and outlines what’s needed to achieve basic failover for each.

Teams Calling Webex Calling Networking
Notify me when live →
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Every tool on this page is backed by a full article walking through the concepts. Start with the guides while the tools roll out.

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