Easy to manage - you control the system - no need for expensive engineers when changes are required. Future-proof - Routine upgrades to the system are applied for all users at no extra cost so your system won't become 'obsolete' or 'unsupported'. As new technology brings new features you will have them available to you.
A SIP trunk is quite simply
Donald Mackay —
Equipment a bit too sophisticated for a small firm. They hint that any revision training will be charged
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