VoIP Phones - Cisco SPA: Difference between revisions
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In short, set it up without echo cancellation, a-law only, no fax detect, no jitter adjust (set to high), UK line impedance, zero gain, etc.
'''PLEASE NOTE: If your line has a noticeable echo, turning on echo cancellation may assist.'''
'''Do not use +44 as part of the username, otherwise the device will not register. You must use 0.'''
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