Knowledge

Virtual numbers and SMS forwarding services split into two very different products for anyone who wants to receive SMS abroad: a second number that only receives SMS, useful for non-banking accounts, and a forwarding service that relays messages from your real home SIM to an app. The second type is far more useful for travel, … Read more

Importing telecom hardware from China works when the sequence is planned in advance: confirm the configuration and MOQ, choose a shipping method matched to the order, prepare customs documentation with correct values and classifications, and agree payment and inspection terms before the goods ship. The failures in importing are rarely the hardware; they are the … Read more

A VoIP gateway is the bridge between an IP telephony network and the public phone network: it converts SIP calls into the trunks, SIM channels, or analog lines that connect to real phone numbers. The four main types are GSM gateways, FXS gateways, FXO gateways, and trunk gateways, and the right type depends on which … Read more

An IP PBX is the call brain that manages extensions and features, and a VoIP gateway is the trunk layer that connects the system to the public phone network; they are complementary systems, not alternatives. A business usually needs both: the PBX inside the network for call logic, and the gateway at the edge for … Read more

A GSM VoIP gateway gives a phone system SIM-based trunks with local mobile numbers, while a SIP trunk connects the same system to a provider's network over the internet; the choice is a trade between number ownership and network reach. The GSM path wins on local presence, fixed per-SIM costs, and independence from provider routing, … Read more

A VoIP gateway port is one concurrent call channel: a 16-port gateway carries up to 16 simultaneous external calls, regardless of how many extensions sit behind it. The port tier you need is decided by the measured peak of concurrent external calls, with headroom, not by user count, which is why the same gateway tier … Read more

Configuring a VoIP gateway follows a fixed sequence: connect and log in, set the network, register the SIP trunks or SIMs, configure dial routes, confirm codecs and NAT, and finish with a test call. Most configuration problems trace to one of three places, the network path, the registration, or the dial plan, and this guide … Read more

A VoIP gateway gives a hotel its own SIM-based voice trunks: local mobile numbers, no fixed-line contracts per room, and call records that flow into the billing system. The right deployment pairs a PBX for room logic with a gateway for external trunks, sized by peak concurrent external calls rather than room count. This guide … Read more

The clean way to connect Asterisk to SIM or trunk voice is a SIP gateway: Asterisk registers a trunk to the gateway, and the gateway carries the calls to the mobile or fixed network, which keeps Asterisk's dial plan as the only place call logic lives. The alternative of attaching GSM modules directly through chan_dongle … Read more

A VoIP gateway handles exactly as many concurrent calls as it has ports: a 16-port gateway carries 16 simultaneous conversations, and each new call waits for a port to free up. The published port count is the ceiling, and the practical concurrency is usually lower, because codecs, signaling, SIM health, and network bandwidth each take … Read more