Auto Redial Busy External Number

Most legacy PBX systems have an auto-redial feature. The PBX system can redial the last dialled number if it is busy or unanswered. Extension A calls B(external number). B does not answer or is busy. A dials auto redial feature code. PBX tries to connect B every 1 minute. If B answers, PBX rings A and connects the calls. 

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