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Phone HD capability when in a PSTN call

Question asked by schepsmel Partner on Apr 13, 2017
Latest reply on Apr 17, 2017 by schepsmel

I have a customer that has their Phone HD registered to their iPECS phone system as a SIP extension.  When in a PSTN call they swear black and blue that they can hit the 'ADD' button and enter another PSTN phone number to create a 3-way PSTN conference call.  I tried replicating this but cannot.  Is this even technical possible?