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Document
- a headcall may be connected to a traditional phone system (PSTN), or vice versa, via a headcall telecom gateway. such a connection is a payable service provided by 3rd-party vendors operating a telecom gateway.
- a headcall telecom gateway consists of a soft-switch and a gateway array. (upward gateway needs no switch)
- a headcall soft-switch forwards a call to a suitable gateway according to the caller's headcall number or the caller's IP address or the callee's phone number.
- there are several methods to locate a headcall terminal being called from PSTN, such as a pair-bounding scheme between a headcall number and a PSTN number.
- headcall provides a reliable accounting facility for downward gateway service. third-party operators may select to use their own accounting software.
- all headcall telecom gateway service providers enjoy the benefit of being able to provide their service free accesses to worldwide headcall users without any cost burdens.
- a telecom gateway operator receives no compensation from worldwide headcall-to-headcall connections but will get paid for connections between headcall users and PSTN users.
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call to mobile and landline