Direct Line access to line 1 to be able to dial forward code threw the provider

I have a customer with 15 locations all have 02 analog modules x2. For the Christmas holidays they need to forward there main number to there main headquarters. They have NEC telephone systems at there other locations and just press line 1 and dial *72 and the forward number to forward to headquarters. On the Yeastar S20 there are not configured for Direct line appearance. So when the dial out they are grabbing the last line. Is there a why to dial a line code to grab line one and they dial the forward code and the number where I will be forwarding to.


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