Atlantis Land A02-RAV260-W54 - Manual (Page 88)

VoIPMaster 260W
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2. Dial *90 (e.g. *907401), there will be a
confirmation tone then hang up. The other end will hear ring
back and the called third-party phone will ring. When the
third-party phone is picked up the two calls will be
connected.
If the third-party phone does not answer then the caller
being transferred can hang up to cancel the connect
attempt.