A Hong Kong local phone number would be very useful to kick off your business here and in fact, you could establish your virtual presence conveniently by subscribing to a licensed HK DID SIP trunk service provider .
The DID stands for direct inward dialing and describes the functionality to receive call. SIP is the industry standard for handling calls over internet. In essence, the provider is using SIP technology to let you receive and send calls using a HK number even you are not physically in HK.
They will give you a local HK number and route all incoming calls to this HK number via internet to your overseas office or call center. In the simplest way, you just need a IP phone in order to receive calls from and dial out via the HK number.
When you have multiple HK DID numbers or a team of agents to answer calls, you need a SIP-based telephone system for distributing and logging the calls. These systems usually provide other value-added features like IVRS, conversation recording and follow-me. Sophisticated ones could even allow you to monitor your agents on-the-fly and gather useful performance statistics.