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A SIP softphone for Mac, iPhone and iPad. Bring your own SIP account from a PBX or provider.

SIPdia is a product of SpaGreen Creative.

Not for emergency calls. Whether emergency numbers work depends on your SIP provider, and the app cannot share your location.

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© 2026 SpaGreen Creative. SIPdia is a trademark of its owner. Asterisk, Issabel, FreePBX, 3CX, FusionPBX and other names belong to their respective owners; no affiliation or endorsement is implied.

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Tools

SIP and VoIP tools

Small, useful utilities for SIP administrators and curious users. Everything runs in your browser; nothing is uploaded.

SIP URI generator Build and validate sip: and sips: URIs with user, host, port and transport.
SIP response code lookup What 401, 403, 408, 488 and other common SIP responses mean, with typical causes.
VoIP bandwidth calculator Per-call and per-site bandwidth by codec, packetization, SRTP and IP version, with assumptions shown.
SIP port reference Default and configurable ports for SIP, TLS, RTP, STUN and common PBX setups, each with a source.