Side by side

CallMeter vs sipmon

Both stand on voip monitoring software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

CallMeter

Free trial APISelf-hostedWeb

CallMeter combines configurable SIP testing, continuous probes, and programmatic controls for voice infrastructure teams. The trial terms and distinction between public cloud workers and private-network user-owned workers are worth reviewing first.

Visit CallMeter

sipmon

Paid LinuxSelf-hosted

sipmon brings SIP correlation, media metrics, and diagnostic rules into a standalone Linux tool. On busy relay hosts, capture may need filtering or a dedicated mirrored capture box.

Visit sipmon

The facts

	CallMeter	sipmon
Free plan	Not published	Not published
Open source	No	Not published
Runs on	API, Self-hosted, Web	Linux, Self-hosted
Lowest paid plan	Free or on request	Not published
Plans published	6	None
Maker	Not published	Not published
Website	callmeter.io	github.com
On voip monitoring software	#7 of 20	#19 of 20

CallMeter: what it does well

Measures more than 90 real-time quality metrics.
Configurable SIP load tests include message capture.
Continuous probes can send webhook notifications.
REST API supports CI/CD quality gates.
User-owned workers keep signaling and media in-network.

What to know first

Seven-day trial requires a valid payment method.
Trial converts to a paid subscription unless canceled.
Cloud workers reach only publicly exposed SIP infrastructure.
Pricing is available on request.

sipmon: what it does well

Runs without a PBX.
Accepts live, file, stdin, and event-log captures.
Reports jitter, loss, delay estimates, and MOS.
Includes more than 20 diagnostic rules.
Does not store raw RTP payload.

What to know first

Linux is the listed platform.
High-rate capture can compete with rtpengine for CPU.
Synthetic call tests are not included.

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