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You receive a call. You put the call on hold. After you unhold you cannot hear the person anymore. They can still hear you. Reverted back to 8.7.5.17 phone works fine. Tested on 6 different phones. All do the same.

Thanks

We have a similar issue with D715 phones and firmware 8.7.5.28. But in our case no voice can be heard at both ends (even though the sip server (asterisk) is still sending the stream to the phone). I've traced a call and after the INVITE with sendrecv (so the "reinvite") I can see that the snom phone sends two RTP packets before it stops sending any further packets. At the same time asterisk is still sending the stream, but the phone doesn't want to "play it back" (the stream reaches the phone, we've made the traces in the LAN where the phone is located). 

We needed to update to 8.7.5.28 as lots of D715 phones suddenly started with a clicking-noises during the call. (One click every 800ms or so). The "click" is part of the RTP stream, so it does not have anything to do with jitter or so. Luckily the Audio changes introduced with 8.7.5.28 seem to have fixed this at well (even though it's not mentioned in the Changelog, but maybe it was the same issue that lead to the "Choppy audio on synthesizer tones, eg. ringing, dial tone, ring back tone, hold (Snom 715/D715,725/D725,D765,D375)".

It seems to help to put the call on hold again and to unhold it after a short timeout. So when pressing the button 3 times it seems to work... This is not a solution at all, but kind of a workaround.

Here exactly the same issue with several upgraded Snom 320 and a Snom 370 device now running on 8.7.5.35. Version 8.7.3.19 was installed before without this problem. (but with another call forwarning issue "Transfer Failed" whitch is fixed in a newer release so I need to upgrade).

The PBX is a hosted PBX (basicly running Asterix).