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Free SIP Calling

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With OnSIP, making calls to any SIP address or receiving calls to your SIP address are always free!

Every user, application, group and resource has a SIP address, which can be found in the detail section under "SIP Address". This is your public SIP address.

Users on a SIP phone or public SIP network, such as SIPPhone, GizmoPhone, or FWD can dial a SIP address directly to call you for free. You can also get the SIP address of any friend or colleague on any public network and call directly for free.

Extension to Extension calls, which are inherently SIP calls, are also always free.