Incoming call from a PSTN number is disconnected when you put the call on hold on a Lync Phone Edition telephone

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This issue occurs when the call is from a public switched telephone network (PSTN) number.

Resolution

To resolve this issue, install the following cumulative updates:

2988177 August 2014 Cumulative Update for Lync Phone Edition for Aastra 6721ip and Aastra 6725ip telephones (KB2988177)
2988178 August 2014 Cumulative Update for Lync Phone Edition for HP 4110 and HP 4120 telephones (KB2988178)
2988181 August 2014 Cumulative Update for Lync Phone Edition for Polycom CX500, Polycom CX600, and Polycom CX3000 (KB2988181)
2988182 August 2014 Cumulative Update for Lync Phone Edition for Polycom CX700 and LG-Nortel IP Phone 8540 telephones (KB2988182)