SIP
Backend requiredCheck whether a SIP/VoIP server responds to OPTIONS requests and inspect its basic capabilities.
Not enabled. SIP probing is disabled until abuse protections for VoIP infrastructure and target authorization are in place.
In the meantime, try the User Agent checker or browse all tools.
Planned interface
Preview — not functional yetResults will appear here once SIP is available.
How it works
The server sends a SIP OPTIONS request and reports the response code, latency and advertised capabilities.
Safeguards & responsible use
- Server-side input validation: only syntactically valid hostnames and IP addresses are accepted.
- Private, loopback, link-local and reserved address ranges are blocked to protect internal infrastructure.
- Per-client rate limiting and request timeouts.
Frequently asked questions
Why does my SIP server not respond?
Many servers ignore OPTIONS from unknown sources as protection against scanners. Check your firewall and SIP security settings.
Will it test UDP and TLS?
UDP, TCP and TLS transports are planned.